1 files changed, 1 insertions, 0 deletions
diff --git a/README.md b/README.md
index 08a21bf..9bc0436 100644
--- a/README.md
+++ b/README.md
@@ -132,6 +132,7 @@ Register an event handler for the given type.
 ### off
 
 Remove an event handler for the given type.
+If omit the `handler`, all event handlers of the given type are deleted.
 
 #### Parameters