diff --git a/packages/react/src/ReactChildren.js b/packages/react/src/ReactChildren.js
index 664c48302ead0..eb9ef5aca9ca7 100644
--- a/packages/react/src/ReactChildren.js
+++ b/packages/react/src/ReactChildren.js
@@ -212,7 +212,7 @@ type MapFunc = (child: ?React$Node) => ?ReactNodeList;
  *
  * See https://reactjs.org/docs/react-api.html#reactchildrenmap
  *
- * The provided mapFunction(child, key, index) will be called for each
+ * The provided mapFunction(child, index) will be called for each
  * leaf child.
  *
  * @param {?*} children Children tree container.