diff --git a/phpBB/language/en/common.php b/phpBB/language/en/common.php
index 501195de72..677b228cc6 100644
--- a/phpBB/language/en/common.php
+++ b/phpBB/language/en/common.php
@@ -758,7 +758,7 @@ $lang = array_merge($lang, array(
 	),
 	'TRACKED_PHP_ERROR'	=> 'Tracked PHP errors: %s',
 
-	'UNABLE_GET_IMAGE_SIZE'	=> 'It was not possible to determine the dimensions of the image.',
+	'UNABLE_GET_IMAGE_SIZE'	=> 'It was not possible to determine the dimensions of the image. Please verify that the URL you entered is correct.',
 	'UNABLE_TO_DELIVER_FILE'=> 'Unable to deliver file.',
 	'UNKNOWN_BROWSER'		=> 'Unknown browser',
 	'UNMARK_ALL'			=> 'Unmark all',