diff --git a/src/main/java/Model/ExchangeObserver.java b/src/main/java/Model/ExchangeObserver.java
index ad3f6a5..145f3cc 100644
--- a/src/main/java/Model/ExchangeObserver.java
+++ b/src/main/java/Model/ExchangeObserver.java
@@ -7,10 +7,10 @@
  */
 public interface ExchangeObserver {
 
-    /**
-     * Called by the Exchange after its state has changed.
-     *
-     * @param exchange the Exchange that triggered the notification
-     */
-    void onExchangeUpdated(Exchange exchange);
+  /**
+   * Called by the Exchange after its state has changed.
+   *
+   * @param exchange the Exchange that triggered the notification
+   */
+  void onExchangeUpdated(Exchange exchange);
 }