diff --git a/wagtail/wagtailimages/tests/test_admin_views.py b/wagtail/wagtailimages/tests/test_admin_views.py
index 479575513f..9f18681ee1 100644
--- a/wagtail/wagtailimages/tests/test_admin_views.py
+++ b/wagtail/wagtailimages/tests/test_admin_views.py
@@ -17,7 +17,6 @@ from wagtail.wagtailimages.views.serve import generate_signature
 from .utils import Image, get_test_image_file
 
 # Get the chars that Django considers safe to leave unescaped in a URL
-# This list changed in Django 1.8:  https://github.com/django/django/commit/e167e96cfea670422ca75d0b35fe7c4195f25b63
 urlquote_safechars = RFC3986_SUBDELIMS + str('/~:@')