su: add note about SIGKILL to the man page

Addresses: https://github.com/karelzak/util-linux/issues/443
Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/login-utils/su.1 b/login-utils/su.1
index d6c615392907bfed7633bd570c699a26a4aba420..84ca104ef4d86f55e504bbfe1763e775b3ffa537 100644 (file)
--- a/login-utils/su.1
+++ b/login-utils/su.1
@@ -165,8 +165,9 @@ Upon receiving either
 or
 .BR SIGTERM ,
 .B su
-terminates its child and afterwards terminates itself with
-the received signal.
+terminates its child and afterwards terminates itself with the received signal.
+The child is terminated by SIGTERM, after unsuccessful attempt and 2 seconds of
+delay the child is killed by SIGKILL.
 .SH CONFIG FILES
 .B su
 reads the