diff --git a/index.js b/index.js
index <HASH>..<HASH> 100644
--- a/index.js
+++ b/index.js
@@ -49,6 +49,7 @@ function getImageSearchResults(searchTerm, callback, start, num) {
         // Google CSE returns a JSON object with a field called "error" if quota is exceed.
       if(data.error && data.error.errors) {
         resultsArray.push(data.error.errors[0]);
+        // return the JSON formatted error message in the callback
         callback(resultsArray);
       } else {
         // search returned results
@@ -58,7 +59,6 @@ function getImageSearchResults(searchTerm, callback, start, num) {
         callback(resultsArray);
       }
     });
-
   });
 }
Clarified comments to usage quota exceeded error handling.