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diff --git a/rt/lib/RT/CustomFieldValues/Groups.pm b/rt/lib/RT/CustomFieldValues/Groups.pm
index feeeadbd7..d37f7a430 100644
--- a/rt/lib/RT/CustomFieldValues/Groups.pm
+++ b/rt/lib/RT/CustomFieldValues/Groups.pm
@@ -2,7 +2,7 @@
 #
 # COPYRIGHT:
 #
-# This software is Copyright (c) 1996-2013 Best Practical Solutions, LLC
+# This software is Copyright (c) 1996-2017 Best Practical Solutions, LLC
 #                                          <sales@bestpractical.com>
 #
 # (Except where explicitly superseded by other copyright notices)
@@ -53,10 +53,42 @@ use warnings;
 
 use base qw(RT::CustomFieldValues::External);
 
+=head1 NAME
+
+RT::CustomFieldValues::Groups - Provide RT's groups as a dynamic list of CF values
+
+=head1 SYNOPSIS
+
+To use as a source of CF values, add the following to your F<RT_SiteConfig.pm>
+and restart RT.
+
+    # In RT_SiteConfig.pm
+    Set( @CustomFieldValuesSources, "RT::CustomFieldValues::Groups" );
+
+Then visit the modify CF page in the RT admin configuration.
+
+=head1 METHODS
+
+Most methods are inherited from L<RT::CustomFieldValues::External>, except the
+ones below.
+
+=head2 SourceDescription
+
+Returns a brief string describing this data source.
+
+=cut
+
 sub SourceDescription {
     return 'RT user defined groups';
 }
 
+=head2 ExternalValues
+
+Returns an arrayref containing a hashref for each possible value in this data
+source, where the value name is the group name.
+
+=cut
+
 sub ExternalValues {
     my $self = shift;