diff --git a/src/Backend.cs b/src/Backend.cs
index 92a18b6..f2d30ff 100644
--- a/src/Backend.cs
+++ b/src/Backend.cs
@@ -22,6 +22,9 @@ namespace WorldOfPeacecraft
 		private bool initialized = false;
 		private Pathwalker Pathwalker = new Pathwalker();
 
+        public delegate void ChallengeEventHandler(Challenge c);
+        public event ChallengeEventHandler Challenge;
+
 		public Backend (IGui gui)
 		{
 			Gui = gui;