diff --git a/doc/haproxy.1 b/doc/haproxy.1
index 7554f9d..4c2d786 100644
--- a/doc/haproxy.1
+++ b/doc/haproxy.1
@@ -105,7 +105,8 @@
 .TP
 \fB\-p <pidfile>\fP
 Ask the process to write down each of its children's pids to this file
-in daemon mode.
+in daemon mode or ask the process to write down its master's pid to
+this file in master-worker mode.
 
 .TP
 \fB\-dk\fP