diff --git a/lib/libc/sys/mkdir.2 b/lib/libc/sys/mkdir.2
index 09f32e89350e..0f02069b15d4 100644
--- a/lib/libc/sys/mkdir.2
+++ b/lib/libc/sys/mkdir.2
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)mkdir.2	6.7 (Berkeley) 3/10/91
-.\"	$Id: mkdir.2,v 1.4 1993/11/29 21:25:21 jtc Exp $
+.\"	$Id: mkdir.2,v 1.5 1993/12/15 17:40:20 jtc Exp $
 .\"
 .Dd March 10, 1991
 .Dt MKDIR 2
@@ -39,6 +39,7 @@
 .Nm mkdir
 .Nd make a directory file
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
 .Fd #include <sys/stat.h>
 .Ft int
 .Fn mkdir "const char *path" "mode_t mode"
diff --git a/lib/libc/sys/mkfifo.2 b/lib/libc/sys/mkfifo.2
index 9de7c941d654..8c9d01137d6b 100644
--- a/lib/libc/sys/mkfifo.2
+++ b/lib/libc/sys/mkfifo.2
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"	from: @(#)mkfifo.2	6.4 (Berkeley) 7/23/91
-.\"	$Id: mkfifo.2,v 1.3 1993/11/29 21:25:22 jtc Exp $
+.\"	$Id: mkfifo.2,v 1.4 1993/12/15 17:40:23 jtc Exp $
 .\"
 .Dd July 23, 1991
 .Dt MKFIFO 2
@@ -39,6 +39,7 @@
 .Nm mkfifo
 .Nd make a fifo file
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
 .Fd #include <sys/stat.h>
 .Ft int
 .Fn mkfifo "const char *path" "mode_t mode"