diff --git a/core-lib/src/main/java/de/kentoj/scrowlib/economy/EconomyService.java b/core-lib/src/main/java/de/kentoj/scrowlib/economy/EconomyService.java
index d509120..2a24cc9 100644
--- a/core-lib/src/main/java/de/kentoj/scrowlib/economy/EconomyService.java
+++ b/core-lib/src/main/java/de/kentoj/scrowlib/economy/EconomyService.java
@@ -10,12 +10,14 @@ public interface EconomyService {
     int getCoins(UUID playerId);
 
     /**
+     * adds coins to the players account
      * @param playerId uuid of player
      * @throws IllegalArgumentException if amount is less than 0
      */
     void depositCoins(UUID playerId, int amount);
 
     /**
+     * tries to take coins from the player's account or returns false on insufficient funds
      * @param playerId uuid of player
      * @return true on success, false on insufficient funds
      * @throws IllegalArgumentException if amount is less than 0