Mention match_group_by_gid

diff --git a/doc/UPGRADE b/doc/UPGRADE
index 05f4dbfbca1b4aef4ebdd9d668a052bc3fa38b64..bcd91bb56c910591b70d141a830e9cf19bd8ece5 100644 (file)
--- a/doc/UPGRADE
+++ b/doc/UPGRADE
@@ -136,6 +136,10 @@ o Upgrading from a version prior to 1.8.2:
        lookup by name of the group "fireflies" would have matched
        the "fireflie" group on most systems.
 
+    The legacy group matching behavior may be restored by enabling
+    the match_group_by_gid Defaults option in sudoers available
+    in sudo 1.8.18 and higher.
+
 o Upgrading from a version prior to 1.8.1:
 
     Changes in the sudoers parser could result in parse errors for