diff --git a/src/Illuminate/Http/Response.php b/src/Illuminate/Http/Response.php
index 7e3f0d480e2e..ef158d276a7c 100755
--- a/src/Illuminate/Http/Response.php
+++ b/src/Illuminate/Http/Response.php
@@ -94,7 +94,7 @@ protected function shouldBeJson($content)
      * Morph the given content into JSON.
      *
      * @param  mixed  $content
-     * @return string
+     * @return string|false
      */
     protected function morphToJson($content)
     {