diff --git a/doc/effective_go.html b/doc/effective_go.html
index 094ab3d921c..74f9f3db9f2 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -850,7 +850,7 @@ func Compare(a, b []byte) int {
 }
 </pre>
 
-<h2 id="type_switch">Type switch</h2>
+<h3 id="type_switch">Type switch</h3>
 
 <p>
 A switch can also be used to discover the dynamic type of an interface