diff --git a/bin/kill/kill.1 b/bin/kill/kill.1
index 0d3754626ee..b977e7899ab 100644
--- a/bin/kill/kill.1
+++ b/bin/kill/kill.1
@@ -87,6 +87,9 @@ group ID of the sender, and for which the process has permission.
 .It -1
 If superuser, broadcast the signal to all processes; otherwise broadcast
 to all processes belonging to the user.
+.It - Ns Ar PGID
+The signal is sent to all processes that belong to the specified
+process group ID (PGID).
 .El
 .Pp
 Some of the more commonly used signals: