diff --git a/doc/sample.config b/doc/sample.config
index 2d81b8bc..7aab0c40 100644
--- a/doc/sample.config
+++ b/doc/sample.config
@@ -109,7 +109,8 @@ use-utmp = true
 # PID file
 pid-file = /var/run/ocserv.pid
 
-# socket file
+# socket file used for IPC, will be appended with .PID
+# It must be accessible within the chroot environment (if any)
 socket-file = /var/run/ocserv-socket
 
 run-as-user = nobody