add reference

gnome-commander.spec

@@ -86,6 +86,7 @@ Source1:       gnome-commander.sh
 Source2:       create-gcmd-git-bare-tarball.sh
 Source10:      mimeedit-svn%{mimeedit_rev}.sh
 Patch1:        gnome-commander-1.6.0-path-fedora-specific.patch
+# https://gitlab.gnome.org/GNOME/gnome-commander/-/merge_requests/19
 Patch101:      gnome-commander-1.12.x-git-0001-GnomeCmdFile-get_adate-fix-compilation.patch
 
 BuildRequires: gcc-c++