Index: configs/samples/pjsip.conf.sample
--- configs/samples/pjsip.conf.sample.orig
+++ configs/samples/pjsip.conf.sample
@@ -172,6 +172,8 @@
 ;protocol=flow
 
 ; Example IPv4 TCP transport with Keepalive options
+; These timers cannot be set per-socket in OpenBSD; some can be set
+; system-wide, see sysctl(2) net.inet.tcp.(keepidle,keepinittime,keepintvl)
 ;
 ;[transport-tcp]
 ;type=transport
