diff --git a/man2/sigaction.2 b/man2/sigaction.2
index 2b4d110fd..1397219d8 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -35,6 +35,7 @@
 .\" Modified 2004-11-17 by Michael Kerrisk <mtk-manpages@gmx.net>
 .\"	Updated discussion for POSIX.1-2001 and SIGCHLD and sa_flags.
 .\"	Formatting fixes
+.\" 2004-12-09, mtk, added SI_TKILL + other minor changes
 .\"
 .TH SIGACTION 2 2004-11-11 "Linux 2.6.9" "Linux Programmer's Manual"
 .SH NAME
@@ -258,13 +259,16 @@ c s
 l l.
 \fIsi_code\fR
 Value:Signal origin
-SI_USER:kill, sigsend or raise
+SI_USER:kill(), sigsend(), or raise()
 SI_KERNEL:The kernel
-SI_QUEUE:sigqueue
-SI_TIMER:timer expired
-SI_MESGQ:mesq state changed
+SI_QUEUE:sigqueue()
+SI_TIMER:POSIX timer expired
+SI_MESGQ:POSIX message queue state changed (since Linux 2.6.6)
 SI_ASYNCIO:AIO completed
 SI_SIGIO:queued SIGIO
+SI_TKILL:tkill() or tgkill() (since Linux 2.4.19)
+.\" FIXME? SI_DETHREAD is defined in 2.6.9 sources, but doesn't yet
+.\" seem to be implemented.  Maybe it will be later?  Dec 04, MTK
 .TE
 
 .TS