diff --git a/doc/api/util.md b/doc/api/util.md
index 7f15d418be2ed5..8210f33a2a664b 100644
--- a/doc/api/util.md
+++ b/doc/api/util.md
@@ -450,7 +450,7 @@ util.formatWithOptions({ colors: true }, 'See object %O', { foo: 42 });
 // when printed to a terminal.
 ```
 
-## `util.getCallSites(frameCountOrOptions, [options])`
+## `util.getCallSites([frameCount][, options])`
 
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