diff --git a/man2/ipc.2 b/man2/ipc.2
index 9d8ae0192..fc8228e0a 100644
--- a/man2/ipc.2
+++ b/man2/ipc.2
@@ -47,6 +47,14 @@ Only standard library implementors and kernel hackers need to know about
 .BR ipc ()
 is Linux specific, and should not be used in programs
 intended to be portable.
+.SH NOTES
+On a few architectures, for example ia64, there is no
+.BR ipc ()
+system call; instead
+.BR msgctl (2),
+.BR semctl (2),
+.BR shmctl (2),
+and so on really are implemented as separate system calls.
 .SH "SEE ALSO"
 .BR msgctl (2),
 .BR msgget (2),