diff --git a/firefox.spec b/firefox.spec
index 303f4e7..0e207bd 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -35,6 +35,7 @@ Release:	1
 License:	MPLv1+
 Group:		Networking/WWW
 Url:		http://www.mozilla.com/firefox/
+# https://archive.mozilla.org/pub/firefox/releases/
 Source0:	https://hg.mozilla.org/releases/mozilla-release/archive/%{rel_url}.tar.bz2?/mozilla-release-%{rel_url}.tar.bz2
 Source4:	%{name}.desktop
 Source7:	firefox.cfg