wip docs

diff --git a/subdirmk/README b/subdirmk/README
index bebbf81709c844aa20d9198d84ac58dcdd02d796..28cff6ede159050a46044db7efdcac2abf40c422 100644 (file)
--- a/subdirmk/README
+++ b/subdirmk/README
@@ -108,7 +108,8 @@ per-directory substitutions, for each directory.
 Global definitions
 ------------------
 
-If want to set global variables, such as CC
+If want to set global variables, such as CC, that should only be done
+once.  The usual approach is to include