diff --git a/solution.js b/solution.js
index 2549e32..214dd40 100644
--- a/solution.js
+++ b/solution.js
@@ -1,8 +1,10 @@
 Solution = (function() {
   return {
     isRotation: function(str1, str2) {
-      //your solution goes here
-      return 'missing implementation';
-    }    
+      if (str1.length == 0) return false;
+      if (str1.length != str2.length) return false;
+      return (str1 + str1).indexOf(str2) >= 0;
+    }
+
   }
-}());
\ No newline at end of file
+}());