diff --git a/src/Intervention/Image/Gd/Source.php b/src/Intervention/Image/Gd/Source.php
index 0cf1c99d..8a9d6a7f 100644
--- a/src/Intervention/Image/Gd/Source.php
+++ b/src/Intervention/Image/Gd/Source.php
@@ -35,7 +35,7 @@ class Source extends \Intervention\Image\AbstractSource
 
             default:
                 throw new \Intervention\Image\Exception\NotReadableException(
-                    "Unable to read image type ({$this->type}) only use JPG, PNG or GIF images."
+                    "Unable to read image type ({$this->type}) only use JPG, PNG or GIF images with GD driver."
                 );
                 break;
         }