diff --git a/content/docs/optimizing-performance.md b/content/docs/optimizing-performance.md
index 353b08aef62..6862f9b868e 100644
--- a/content/docs/optimizing-performance.md
+++ b/content/docs/optimizing-performance.md
@@ -233,7 +233,7 @@ could be rewritten using `concat` as:
 ```javascript
 function handleClick() {
   const newWords = words.concat(['marklar']);
-  setWords(words);
+  setWords(newWords);
 }
 ```