From 9a241607f82ecdc7930a050051a1fce4009e9666 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 13 Nov 2019 22:14:48 +0000
Subject: [PATCH] Documentation for usual.mk.in

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 subdirmk/usual.mk.in | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/subdirmk/usual.mk.in b/subdirmk/usual.mk.in
index c40a18f..66c71eb 100644
--- a/subdirmk/usual.mk.in
+++ b/subdirmk/usual.mk.in
@@ -3,6 +3,13 @@
 #  Copyright 2019 Ian Jackson
 # SPDX-License-Identifier: LGPL-2.0-or-later
 
+# Usage:
+#   include subdirmk/usual.mk
+# (probably in toplevel Subdir.sd.mk)
+#
+# Provides various conventional `make' variables, and a
+# rule for compiling C programs.
+
 VPATH		= $(top_srcdir)
 
 prefix		= @prefix@
-- 
2.30.2