diff --git a/gitdm.config b/gitdm.config
index 7378238c20..a3542d2fc7 100644
--- a/gitdm.config
+++ b/gitdm.config
@@ -28,15 +28,15 @@ EmailMap contrib/gitdm/domain-map
 #
 # Use GroupMap to map a file full of addresses to the
 # same employer. This is used for people that don't post from easily
-# identifiable corporate emails.
+# identifiable corporate emails. Please keep this list sorted.
 #
 
-GroupMap contrib/gitdm/group-map-redhat Red Hat
-GroupMap contrib/gitdm/group-map-wavecomp Wave Computing
 GroupMap contrib/gitdm/group-map-cadence Cadence Design Systems
 GroupMap contrib/gitdm/group-map-codeweavers CodeWeavers
 GroupMap contrib/gitdm/group-map-ibm IBM
 GroupMap contrib/gitdm/group-map-janustech Janus Technologies
+GroupMap contrib/gitdm/group-map-redhat Red Hat
+GroupMap contrib/gitdm/group-map-wavecomp Wave Computing
 
 # Also group together our prolific individual contributors
 # and those working under academic auspices