diff --git a/make.spec b/make.spec
index 521165f..7754972 100644
--- a/make.spec
+++ b/make.spec
@@ -26,6 +26,7 @@ Summary:        GNU make
 License:        GPL-2.0+
 Group:          Development/Tools/Building
 Source:         http://ftp.gnu.org/gnu/make/make-%version.tar.bz2
+# from http://savannah.gnu.org/project/memberlist-gpgkeys.php?group=make
 Source1:        http://ftp.gnu.org/gnu/make/make-%version.tar.bz2.sig
 Source2:        %name.keyring
 Patch2:         make-slowdown-parallelism.diff