diff --git a/js2.html b/js2.html
index 4c2a2b1..6bc3bc9 100644
--- a/js2.html
+++ b/js2.html
@@ -592,7 +592,7 @@ <h2>17. memoization</h2>
    else if (n &lt; 2){
      return 1;
    }else{
-     _fibonacci(n-2) + _fibonacci(n-1);
+     return memo[n] = _fibonacci(n-2) + _fibonacci(n-1);
    }
 }
         </code></pre>