diff --git a/README.md b/README.md
index dd29d50e..3a2ae408 100644
--- a/README.md
+++ b/README.md
@@ -162,7 +162,7 @@ If *filter* is specified, sets the filter to the specified function and returns
 
 ```js
 function filter(event) {
-  return !event.ctrlKey && !event.button;
+  return (!event.ctrlKey || event.type === 'wheel') && !event.button;
 }
 ```