diff --git a/Arrays.java b/Arrays.java
index 965a45f..aaa8344 100644
--- a/Arrays.java
+++ b/Arrays.java
@@ -282,7 +282,10 @@ public class Arrays {
      * zum Beispiel <code>["+String 1","+String 2"]</code>.
      */
     public String[] prefix( String[] pArray, String pPrefix ) {
-        return null;
+        for (int i = 0; i < pArray.length; i++) {
+            pArray[i] = pPrefix + pArray[i];
+        }
+        return pArray;
     }
 
     /**