diff --git a/src/main/java/edu/group5/app/control/AuthController.java b/src/main/java/edu/group5/app/control/AuthController.java
index 347a52e..d3d4ebe 100644
--- a/src/main/java/edu/group5/app/control/AuthController.java
+++ b/src/main/java/edu/group5/app/control/AuthController.java
@@ -86,6 +86,7 @@ public void handleSignUp(SignUpPageView view, String firstName, String lastName,
       return;
     }
 
+    // Checks if any input is too long.
     if (firstName.length() > 32 || lastName.length() > 32
         || email.length() > 32 || passwordChars.length > 72) {
         
@@ -148,6 +149,7 @@ public void handleSignUp(SignUpPageView view, String firstName, String lastName,
       return;
     }
 
+    // Privacy policy pop-up.
     Alert privacyPolicy = new Alert(Alert.AlertType.CONFIRMATION);
     privacyPolicy.setTitle("Accept Privacy Policy");
     privacyPolicy.setHeaderText("Accept Privacy Policy");
diff --git a/src/main/java/edu/group5/app/control/DonationController.java b/src/main/java/edu/group5/app/control/DonationController.java
index 07af6fd..3ca392d 100644
--- a/src/main/java/edu/group5/app/control/DonationController.java
+++ b/src/main/java/edu/group5/app/control/DonationController.java
@@ -178,6 +178,12 @@ private void handleDonate() {
       return;
     }
 
+    // Prevents donations that are too complex from being made
+    if (amount.stripTrailingZeros().precision() > 32 || amount.stripTrailingZeros().scale() > 16) {
+      this.showError("The number is too complex, please donate a smaller or less precise number");
+      return;
+    }
+
     // Create donation via service
     boolean success = service.donate(
         customer,