add mixin warning

socketio · Sep 11, 2012 · d4919f1 · d4919f1
1 parent bfb335c
commit d4919f1
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/Readme.md b/Readme.md
@@ -21,6 +21,11 @@ var obj = {};
 Emitter(obj);
 Emitter(User.prototype);
 ```
+
+  __Warning__: if you use `Emitter(Some.prototype)` on a prototype
+  you __must__ invoke `Emitter.call(this)` in the constructor to
+  clear the callbacks object, otherwise events will be shared
+  between multiple objects.
 
 ### Emitter#on(event, fn)