diff --git a/doc/api/util.md b/doc/api/util.md
index 05687698f05f38..295c1d984e2200 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -580,7 +580,7 @@ util.isString(5);
   // false
 ```
 
-## util.isSymbol(object)
+### util.isSymbol(object)
 
     Stability: 0 - Deprecated