diff --git a/src/Intervention/Image/Gd/Decoder.php b/src/Intervention/Image/Gd/Decoder.php
index 6d2d7b4d..11a0bc0b 100644
--- a/src/Intervention/Image/Gd/Decoder.php
+++ b/src/Intervention/Image/Gd/Decoder.php
@@ -57,7 +57,7 @@ class Decoder extends \Intervention\Image\AbstractDecoder
 
             default:
                 throw new NotReadableException(
-                    "Unsupported image type. GD driver is only able to decode JPG, PNG, GIF or WebP files."
+                    sprintf("Unsupported image type %s. GD driver is only able to decode JPG, PNG, GIF or WebP files.", strtolower($mime))
                 );
         }