diff --git a/lib/libc/stdio/fflush.3 b/lib/libc/stdio/fflush.3
index 8f852260ee8d..20b312622baa 100644
--- a/lib/libc/stdio/fflush.3
+++ b/lib/libc/stdio/fflush.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: fflush.3,v 1.12 2003/08/07 16:43:22 agc Exp $
+.\"	$NetBSD: fflush.3,v 1.13 2019/09/07 11:53:27 sevan Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -33,7 +33,7 @@
 .\"
 .\"     @(#)fflush.3	8.1 (Berkeley) 6/4/93
 .\"
-.Dd June 4, 1993
+.Dd September 7, 2019
 .Dt FFLUSH 3
 .Os
 .Sh NAME
@@ -108,3 +108,12 @@ The
 function
 conforms to
 .St -ansiC .
+.Sh HISTORY
+The
+.Fn fflush
+function first appeared in
+.At v4 .
+The
+.Fn fpurge
+function first appeared in
+.Bx 4.4 .