diff --git a/ps/ps.1 b/ps/ps.1
index 4c25da99..0c6c91db 100644
--- a/ps/ps.1
+++ b/ps/ps.1
@@ -269,7 +269,7 @@ Select by real group ID (RGID) or name.  Identical to
 .BI \-\-group \ grplist
 Select by effective group ID (EGID) or name.  This selects the processes
 whose effective group name or ID is in
-.IR grouplist .
+.IR grplist .
 The effective group ID describes the group whose file access permissions are
 used by the process (see
 .IR getegid (2)).