diff --git a/solution.js b/solution.js
index c8ce545..e21c028 100644
--- a/solution.js
+++ b/solution.js
@@ -2,7 +2,24 @@ Solution = (function() {
   return {
     isRotation: function(str1, str2) {
       //your solution goes here
-      throw 'missing implementation';
-    }    
+      if (str1.length != str2.length) 
+        return false
+      
+      var rotatedStr = str1
+      for (i = 0; i < str1.length; i++) {
+        if (rotatedStr == str2) 
+          return true
+        
+        rotatedStr = rotateLeft(rotatedStr)
+          
+      }  
+      
+      return false
+    } 
+    
+    rotateLeft: function(str) {
+      var firstChar = str.charAt(0)
+      return str.substring(1) + firstChar
+    }
   }
-}());
\ No newline at end of file
+}());