diff --git a/UPGRADE_GUIDE.md b/UPGRADE_GUIDE.md
index 0d1e6349dc..0f480149c8 100644
--- a/UPGRADE_GUIDE.md
+++ b/UPGRADE_GUIDE.md
@@ -188,7 +188,7 @@ an option:
 
 // 0.11.x
 var router = Router.create({
-  onErorr: fn,
+  onError: fn,
   // ...
 });
 router.run(callback);