diff --git a/src/main/java/millions/App.java b/src/main/java/millions/App.java
index 825265b..8ffc777 100644
--- a/src/main/java/millions/App.java
+++ b/src/main/java/millions/App.java
@@ -6,6 +6,9 @@
 import millions.controller.GameController;
 import millions.view.StartView;
 
+/**
+ * Main JavaFX application entry point for the Millions stock trading game.
+ */
 public class App extends Application {
 
   @Override
diff --git a/src/main/java/millions/calculators/TransactionCalculatorFactory.java b/src/main/java/millions/calculators/TransactionCalculatorFactory.java
index 8d461bd..36a71c0 100644
--- a/src/main/java/millions/calculators/TransactionCalculatorFactory.java
+++ b/src/main/java/millions/calculators/TransactionCalculatorFactory.java
@@ -5,6 +5,9 @@
 import millions.model.calculators.SaleCalculator;
 import millions.model.calculators.TransactionCalculator;
 
+/**
+ * Factory for creating transaction calculators.
+ */
 public class TransactionCalculatorFactory {
 
   private TransactionCalculatorFactory() {}
diff --git a/src/main/java/millions/controller/GameController.java b/src/main/java/millions/controller/GameController.java
index 075230c..b6e5561 100644
--- a/src/main/java/millions/controller/GameController.java
+++ b/src/main/java/millions/controller/GameController.java
@@ -9,6 +9,7 @@
 import millions.model.Player;
 import millions.model.Stock;
 
+/** Controls game initialization. */
 public class GameController {
   private Player player;
   private Exchange exchange;
diff --git a/src/main/java/millions/controller/fileIO/CSVStockFileParser.java b/src/main/java/millions/controller/fileIO/CSVStockFileParser.java
index 5a0cee0..e52ebf9 100644
--- a/src/main/java/millions/controller/fileIO/CSVStockFileParser.java
+++ b/src/main/java/millions/controller/fileIO/CSVStockFileParser.java
@@ -1,19 +1,18 @@
 package millions.controller.fileIO;
 
-import millions.model.Stock;
-
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import millions.model.Stock;
 
+/** Parses CSV lines into Stock objects. */
 public class CSVStockFileParser {
   private List<String> lines;
 
   public CSVStockFileParser(List<String> lines) {
     if (verifyCSV(lines)) {
       this.lines = lines;
-    }
-    else {
+    } else {
       // throw file format error
     }
   }
@@ -21,22 +20,22 @@ public CSVStockFileParser(List<String> lines) {
   // returns true if all entries have exactly 3 data points
   public boolean verifyCSV(List<String> lines) {
     return lines.stream()
-          .filter(l -> !(l.startsWith("#") || l.isBlank()))
-          .noneMatch(l -> l.split(",").length != 3);
-
+        .filter(l -> !(l.startsWith("#") || l.isBlank()))
+        .noneMatch(l -> l.split(",").length != 3);
   }
 
   public List<Stock> parse() {
     List<Stock> stocks = new ArrayList<>();
     lines.stream()
         .filter(l -> !((l.startsWith("#") || l.isBlank())))
-        .forEach(l -> {
-      String[] split = l.split(",");
-      String symbol = split[0];
-      String company = split[1];
-      BigDecimal price = new BigDecimal(split[2]);
-      stocks.add(new Stock(symbol, company, price));
-    });
+        .forEach(
+            l -> {
+              String[] split = l.split(",");
+              String symbol = split[0];
+              String company = split[1];
+              BigDecimal price = new BigDecimal(split[2]);
+              stocks.add(new Stock(symbol, company, price));
+            });
     return stocks;
   }
 }
diff --git a/src/main/java/millions/controller/fileIO/CSVStockFileWriter.java b/src/main/java/millions/controller/fileIO/CSVStockFileWriter.java
index 463ea04..52fee6e 100644
--- a/src/main/java/millions/controller/fileIO/CSVStockFileWriter.java
+++ b/src/main/java/millions/controller/fileIO/CSVStockFileWriter.java
@@ -8,6 +8,9 @@
 import java.util.List;
 
 //TODO: Validation of data before writing
+/**
+ * Writes stock data to a CSV file.
+ */
 public class CSVStockFileWriter implements StockFileWriter {
   private final List<Stock> stocks;
   private String finalString;
diff --git a/src/main/java/millions/controller/fileIO/StockFileReader.java b/src/main/java/millions/controller/fileIO/StockFileReader.java
index 47a0809..31e37ee 100644
--- a/src/main/java/millions/controller/fileIO/StockFileReader.java
+++ b/src/main/java/millions/controller/fileIO/StockFileReader.java
@@ -10,6 +10,9 @@
 import java.util.List;
 
 
+/**
+ * Reads a file and returns its lines as a list of strings.
+ */
 public class StockFileReader {
   private final Path filePath;
 
diff --git a/src/main/java/millions/controller/fileIO/StockFileWriter.java b/src/main/java/millions/controller/fileIO/StockFileWriter.java
index 32a8e13..cfd1baf 100644
--- a/src/main/java/millions/controller/fileIO/StockFileWriter.java
+++ b/src/main/java/millions/controller/fileIO/StockFileWriter.java
@@ -2,6 +2,9 @@
 
 import java.nio.file.Path;
 
+/**
+ * Interface for writing stock data to a file.
+ */
 public interface StockFileWriter {
   public void formatString();
   public boolean write(Path path);
diff --git a/src/main/java/millions/model/Exchange.java b/src/main/java/millions/model/Exchange.java
index 57d91fd..869cff6 100644
--- a/src/main/java/millions/model/Exchange.java
+++ b/src/main/java/millions/model/Exchange.java
@@ -14,6 +14,9 @@
 import millions.model.factories.SaleFactory;
 import millions.model.factories.TransactionFactory;
 
+/**
+ * The stock exchange where players buy and sell shares. Manages stocks and simulates weekly price changes.
+ */
 public class Exchange {
   private String name;
   private Map<String, Stock> stocks;
diff --git a/src/main/java/millions/model/ExchangeListener.java b/src/main/java/millions/model/ExchangeListener.java
index b75057e..6731d45 100644
--- a/src/main/java/millions/model/ExchangeListener.java
+++ b/src/main/java/millions/model/ExchangeListener.java
@@ -1,5 +1,8 @@
 package millions.model;
 
+/**
+ * Listener for exchange events such as week advances and completed transactions.
+ */
 public interface ExchangeListener {
 
   void onWeekAdvanced(int newWeek);
diff --git a/src/main/java/millions/model/Player.java b/src/main/java/millions/model/Player.java
index 09f43d4..2dfd684 100644
--- a/src/main/java/millions/model/Player.java
+++ b/src/main/java/millions/model/Player.java
@@ -5,6 +5,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/** Player class. */
 public class Player {
   private String name;
   private BigDecimal startingMoney;
@@ -15,6 +16,11 @@ public class Player {
   public int weeksTraded;
   private final List<PlayerListener> listeners = new ArrayList<>();
 
+  /**
+   * @param name Name of player
+   * @param startingMoney Amount of money the player starts with
+   * @throws IllegalArgumentException
+   */
   public Player(String name, BigDecimal startingMoney) {
     this.name = name;
     this.startingMoney = startingMoney;
@@ -31,6 +37,10 @@ public Player(String name, BigDecimal startingMoney) {
     }
   }
 
+  /**
+   * @param amount How much money to add
+   * @throws IllegalArgumentException
+   */
   public void addMoney(BigDecimal amount) {
     if (amount == null || amount.compareTo(BigDecimal.ZERO) < 0) {
       throw new IllegalArgumentException("Amount cannot be null or negative");
@@ -39,6 +49,10 @@ public void addMoney(BigDecimal amount) {
     notifyMoneyChanged();
   }
 
+  /**
+   * @param amount How much money to withdeaw
+   * @throws IllegalArgumentException
+   */
   public void withdrawMoney(BigDecimal amount) {
     if (amount == null || amount.compareTo(BigDecimal.ZERO) < 0) {
       throw new IllegalArgumentException("Amount cannot be null or negative");
@@ -47,6 +61,9 @@ public void withdrawMoney(BigDecimal amount) {
     notifyMoneyChanged();
   }
 
+  /**
+   * @return
+   */
   public String getStatus() {
     // TODO dobbel sjekk logikken
     int weeksTraded = transactionArchive.countDistinctWeeks();
@@ -63,42 +80,69 @@ public String getStatus() {
     return status;
   }
 
+  /**
+   * @return
+   */
   public String getName() {
     return this.name;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getMoney() {
     return this.money;
   }
 
+  /**
+   * @return
+   */
   public Portfolio getPortfolio() {
     return this.portfolio;
   }
 
+  /**
+   * @param share Share to be added
+   */
   public void addShareToPortfolio(Share share) {
     this.portfolio.addShare(share);
     notifyPortfolioChanged();
     notifyStatusChanged();
   }
 
+  /**
+   * @param share Share to be removed
+   */
   public void removeShareFromPortfolio(Share share) {
     this.portfolio.removeShare(share);
     notifyPortfolioChanged();
     notifyStatusChanged();
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getNetWorth() {
     return this.money.add(this.portfolio.getNetWorth());
   }
 
+  /**
+   * @return
+   */
   public TransactionArchive getTransactionArchive() {
     return this.transactionArchive;
   }
 
+  /**
+   * @param listener
+   */
   public void addListener(PlayerListener listener) {
     listeners.add(listener);
   }
 
+  /**
+   * @param listener
+   */
   public void removeListener(PlayerListener listener) {
     listeners.remove(listener);
   }
diff --git a/src/main/java/millions/model/PlayerListener.java b/src/main/java/millions/model/PlayerListener.java
index f576ac7..e397ead 100644
--- a/src/main/java/millions/model/PlayerListener.java
+++ b/src/main/java/millions/model/PlayerListener.java
@@ -2,6 +2,7 @@
 
 import java.math.BigDecimal;
 
+/** Listener for player state changes. */
 public interface PlayerListener {
 
   void onMoneyChanged(BigDecimal newBalance);
diff --git a/src/main/java/millions/model/Portfolio.java b/src/main/java/millions/model/Portfolio.java
index 0c4af05..210f784 100644
--- a/src/main/java/millions/model/Portfolio.java
+++ b/src/main/java/millions/model/Portfolio.java
@@ -5,6 +5,7 @@
 import java.util.List;
 import millions.model.calculators.SaleCalculator;
 
+/** A collection of shares owned by a player. */
 public class Portfolio {
   List<Share> shares;
 
@@ -12,24 +13,42 @@ public Portfolio() {
     shares = new ArrayList<>();
   }
 
+  /**
+   * @param share Share to be added
+   * @return
+   */
   public boolean addShare(Share share) {
     return this.shares.add(share);
   }
 
+  /**
+   * @param share Share to be removed
+   * @return
+   */
   public boolean removeShare(Share share) {
     return this.shares.remove(share);
   }
 
+  /**
+   * @return
+   */
   public List<Share> getShares() {
     return this.shares;
   }
 
+  /**
+   * @param symbol
+   * @return
+   */
   public List<Share> getShares(String symbol) {
     return this.shares.stream()
         .filter(share -> share.getStock().getSymbol().equals(symbol))
         .toList();
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getNetWorth() {
     BigDecimal total = BigDecimal.ZERO;
     for (Share share : shares) {
@@ -39,6 +58,10 @@ public BigDecimal getNetWorth() {
     return total;
   }
 
+  /**
+   * @param share
+   * @return
+   */
   public boolean contains(Share share) {
     return this.shares.contains(share);
   }
diff --git a/src/main/java/millions/model/Purchase.java b/src/main/java/millions/model/Purchase.java
index 59da2c0..8bbacb8 100644
--- a/src/main/java/millions/model/Purchase.java
+++ b/src/main/java/millions/model/Purchase.java
@@ -2,6 +2,9 @@
 
 import millions.model.calculators.PurchaseCalculator;
 
+/**
+ * A transaction representing the purchase of shares.
+ */
 public class Purchase extends Transaction {
 
   public Purchase(Share share, int week) {
diff --git a/src/main/java/millions/model/Sale.java b/src/main/java/millions/model/Sale.java
index dbd3637..1c17745 100644
--- a/src/main/java/millions/model/Sale.java
+++ b/src/main/java/millions/model/Sale.java
@@ -2,6 +2,9 @@
 
 import millions.model.calculators.SaleCalculator;
 
+/**
+ * A transaction representing the sale of shares.
+ */
 public class Sale extends Transaction {
 
   public Sale(Share share, int week) {
diff --git a/src/main/java/millions/model/Share.java b/src/main/java/millions/model/Share.java
index 615dc68..7967b95 100644
--- a/src/main/java/millions/model/Share.java
+++ b/src/main/java/millions/model/Share.java
@@ -2,11 +2,18 @@
 
 import java.math.BigDecimal;
 
+/** Represents a holding of a specific stock with a quantity and purchase price. */
 public class Share {
   Stock stock;
   BigDecimal quantity;
   BigDecimal purchasePrice;
 
+  /**
+   * @param stock Which stock the share is for.
+   * @param quantity How many stocks
+   * @param purchasePrice Purchase price of the share
+   * @throws IllegalArgumentException
+   */
   public Share(Stock stock, BigDecimal quantity, BigDecimal purchasePrice) {
     this.stock = stock;
     this.quantity = quantity;
@@ -23,18 +30,28 @@ public Share(Stock stock, BigDecimal quantity, BigDecimal purchasePrice) {
     }
   }
 
+  /** Share() with int quantity */
   public Share(Stock stock, int quantity, BigDecimal purchasePrice) {
     this(stock, BigDecimal.valueOf(quantity), purchasePrice);
   }
 
+  /**
+   * @return
+   */
   public Stock getStock() {
     return this.stock;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getQuantity() {
     return this.quantity;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getPurchasePrice() {
     return this.purchasePrice;
   }
diff --git a/src/main/java/millions/model/Stock.java b/src/main/java/millions/model/Stock.java
index 65b70da..cc1a23f 100644
--- a/src/main/java/millions/model/Stock.java
+++ b/src/main/java/millions/model/Stock.java
@@ -4,11 +4,18 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/** Stock */
 public class Stock {
   String symbol;
   String company;
   List<BigDecimal> prices;
 
+  /**
+   * @param symbol Stock ticker symbol
+   * @param company company name
+   * @param prices List of prices
+   * @throws IllegalArgumentException
+   */
   public Stock(String symbol, String company, List<BigDecimal> prices) {
     this.symbol = symbol;
     this.company = company;
@@ -23,30 +30,49 @@ public Stock(String symbol, String company, List<BigDecimal> prices) {
     }
   }
 
+  /** Stock() with single price instead of list */
   public Stock(String symbol, String company, BigDecimal initialPrice) {
     this(symbol, company, new ArrayList<>(List.of(initialPrice)));
   }
 
+  /**
+   * @return
+   */
   public String getSymbol() {
     return this.symbol;
   }
 
+  /**
+   * @return
+   */
   public String getCompany() {
     return this.company;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getSalesPrice() {
     return this.prices.getLast();
   }
 
+  /**
+   * @param price Sales price
+   */
   public void addNewSalesPrice(BigDecimal price) {
     this.prices.add(price);
   }
 
+  /**
+   * @return
+   */
   public List<BigDecimal> getHistoricalPrices() {
     return this.prices;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getHighestPrice() {
     BigDecimal highestPrice = this.prices.get(0);
     for (BigDecimal price : this.prices) {
@@ -57,6 +83,9 @@ public BigDecimal getHighestPrice() {
     return highestPrice;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getLowestPrice() {
     BigDecimal lowestPrice = this.prices.get(0);
     for (BigDecimal price : this.prices) {
@@ -67,6 +96,9 @@ public BigDecimal getLowestPrice() {
     return lowestPrice;
   }
 
+  /**
+   * @return
+   */
   public BigDecimal getLatestPriceChange() {
     if (this.prices.size() < 2) {
       return BigDecimal.ZERO;
diff --git a/src/main/java/millions/model/Transaction.java b/src/main/java/millions/model/Transaction.java
index 8dfdd4f..6e1e8b1 100644
--- a/src/main/java/millions/model/Transaction.java
+++ b/src/main/java/millions/model/Transaction.java
@@ -2,6 +2,7 @@
 
 import millions.model.calculators.TransactionCalculator;
 
+/** Abstract base class for stock transactions */
 public abstract class Transaction {
 
   private Share share;
diff --git a/src/main/java/millions/model/TransactionArchive.java b/src/main/java/millions/model/TransactionArchive.java
index 5e8b407..5ae7f9f 100644
--- a/src/main/java/millions/model/TransactionArchive.java
+++ b/src/main/java/millions/model/TransactionArchive.java
@@ -4,6 +4,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
+/** Stores and queries commited transactions. */
 public class TransactionArchive {
 
   List<Transaction> transactions;
diff --git a/src/main/java/millions/model/calculators/PurchaseCalculator.java b/src/main/java/millions/model/calculators/PurchaseCalculator.java
index 1f7b341..ab2608d 100644
--- a/src/main/java/millions/model/calculators/PurchaseCalculator.java
+++ b/src/main/java/millions/model/calculators/PurchaseCalculator.java
@@ -3,6 +3,7 @@
 import java.math.BigDecimal;
 import millions.model.Share;
 
+/** Calculates costs for a purchase transaction. Commission */
 public class PurchaseCalculator implements TransactionCalculator {
   BigDecimal purchasePrice;
   BigDecimal quantity;
diff --git a/src/main/java/millions/model/calculators/SaleCalculator.java b/src/main/java/millions/model/calculators/SaleCalculator.java
index 9b0a84e..a907b46 100644
--- a/src/main/java/millions/model/calculators/SaleCalculator.java
+++ b/src/main/java/millions/model/calculators/SaleCalculator.java
@@ -4,6 +4,7 @@
 import java.math.RoundingMode;
 import millions.model.Share;
 
+/** Calculates costs for a sale transaction. Commission and profit tax */
 public class SaleCalculator implements TransactionCalculator {
   BigDecimal purchasePrice;
   BigDecimal salesPrice;
diff --git a/src/main/java/millions/model/calculators/TransactionCalculator.java b/src/main/java/millions/model/calculators/TransactionCalculator.java
index d2d3917..9e6ecfb 100644
--- a/src/main/java/millions/model/calculators/TransactionCalculator.java
+++ b/src/main/java/millions/model/calculators/TransactionCalculator.java
@@ -2,6 +2,9 @@
 
 import java.math.BigDecimal;
 
+/**
+ * Interface for calculating transaction costs including gross, commission, tax, and total.
+ */
 public interface TransactionCalculator {
   public BigDecimal calculateGross();
 
diff --git a/src/main/java/millions/model/factories/PurchaseFactory.java b/src/main/java/millions/model/factories/PurchaseFactory.java
index e2b52f7..0af39aa 100644
--- a/src/main/java/millions/model/factories/PurchaseFactory.java
+++ b/src/main/java/millions/model/factories/PurchaseFactory.java
@@ -3,6 +3,9 @@
 import millions.model.Purchase;
 import millions.model.Share;
 
+/**
+ * Factory for creating purchase transactions.
+ */
 public class PurchaseFactory extends TransactionFactory {
   public Purchase createTransaction(Share share, int week) {
     return new Purchase(share, week);
diff --git a/src/main/java/millions/model/factories/SaleFactory.java b/src/main/java/millions/model/factories/SaleFactory.java
index 4da40ee..6753a5e 100644
--- a/src/main/java/millions/model/factories/SaleFactory.java
+++ b/src/main/java/millions/model/factories/SaleFactory.java
@@ -3,6 +3,9 @@
 import millions.model.Sale;
 import millions.model.Share;
 
+/**
+ * Factory for creating sale transactions.
+ */
 public class SaleFactory extends TransactionFactory {
   public Sale createTransaction(Share share, int week) {
     return new Sale(share, week);
diff --git a/src/main/java/millions/model/factories/TransactionFactory.java b/src/main/java/millions/model/factories/TransactionFactory.java
index 8c2eb5c..e77d31d 100644
--- a/src/main/java/millions/model/factories/TransactionFactory.java
+++ b/src/main/java/millions/model/factories/TransactionFactory.java
@@ -3,6 +3,9 @@
 import millions.model.Share;
 import millions.model.Transaction;
 
+/**
+ * Abstract factory for creating transactions.
+ */
 public abstract class TransactionFactory {
   public abstract Transaction createTransaction(Share share, int week);
 }
diff --git a/src/main/java/millions/view/StartView.java b/src/main/java/millions/view/StartView.java
index 564883b..0c85a46 100644
--- a/src/main/java/millions/view/StartView.java
+++ b/src/main/java/millions/view/StartView.java
@@ -10,6 +10,7 @@
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 
+/** The initial game setup screen where the player enters their info. */
 public class StartView extends VBox {
 
   private TextField nameField;