diff --git a/aiocraft/traits/callbacks.py b/aiocraft/traits/callbacks.py
index 6bd2499..a3b4ed5 100644
--- a/aiocraft/traits/callbacks.py
+++ b/aiocraft/traits/callbacks.py
@@ -24,6 +24,7 @@ class CallbacksHolder:
 		if key not in self._callbacks:
 			self._callbacks[key] = []
 		self._callbacks[key].append(callback)
+		return callback
 
 	def trigger(self, key:Any) -> List[Callable]:
 		if key not in self._callbacks: