diff --git a/lib/libc/sys/umask.2 b/lib/libc/sys/umask.2
index 00ff4e72840..983ce6536a2 100644
--- a/lib/libc/sys/umask.2
+++ b/lib/libc/sys/umask.2
@@ -77,6 +77,7 @@ The
 system call is always successful.
 .Sh SEE ALSO
 .Xr chmod 2 ,
+.Xr mkfifo 2 ,
 .Xr mknod 2 ,
 .Xr open 2
 .Sh STANDARDS