diff --git a/lib/libc/stdio/putc.3 b/lib/libc/stdio/putc.3
index e7d3dae584a9..1cf830cf6749 100644
--- a/lib/libc/stdio/putc.3
+++ b/lib/libc/stdio/putc.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: putc.3,v 1.12 2010/05/06 09:01:34 jruoho Exp $
+.\"	$NetBSD: putc.3,v 1.13 2017/02/22 15:08:55 abhinav Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -133,6 +133,7 @@ a write error occurs,
 or if an attempt is made to write a read-only stream.
 .Sh SEE ALSO
 .Xr ferror 3 ,
+.Xr flockfile 3 ,
 .Xr fopen 3 ,
 .Xr getc 3 ,
 .Xr stdio 3