diff --git a/README.md b/README.md
index 9a325a355b..0da3bd760f 100644
--- a/README.md
+++ b/README.md
@@ -361,7 +361,7 @@ Other Style Guides
     const someStack = [];
 
     // bad
-    someStack[someStack.length] = 'abracadabra';
+    someStack[someStack.length - 1] = 'abracadabra';
 
     // good
     someStack.push('abracadabra');