diff --git a/doc/api/util.md b/doc/api/util.md
index 1083eb03568823..3f9165f02110af 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -498,7 +498,7 @@ util.isString(5)
   // false
 ```
 
-## util.isSymbol(object)
+### util.isSymbol(object)
 
     Stability: 0 - Deprecated