diff --git a/lib/libutil/pidfile.3 b/lib/libutil/pidfile.3
index d10ab81e4f8..8b604cbb806 100644
--- a/lib/libutil/pidfile.3
+++ b/lib/libutil/pidfile.3
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 16, 2011
+.Dd February 8, 2012
 .Dt PIDFILE 3
 .Os
 .Sh NAME
@@ -85,6 +85,9 @@ function sets the O_CLOEXEC close-on-exec flag when opening the pidfile.
 The
 .Fn pidfile_write
 function writes process' PID into a previously opened file.
+The file is truncated before write, so calling the
+.Fn pidfile_write
+function multiple times is supported.
 .Pp
 The
 .Fn pidfile_close