This is all documented in README now.
And it's about to become out of date.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
#
# $(srcdir)/subdirmk/generate [--srcdir=SRCDIR] [--] SUBDIR...
#
#
# $(srcdir)/subdirmk/generate [--srcdir=SRCDIR] [--] SUBDIR...
#
-# generates in each subdirectory from in each subdirectory
-# Subdir.mk.tmp Subdir.sd.mk
-# Makefile and included files
-# and in toplevel and in toplevel
-# main.mk.tmp Perdir.sd.mk
+# generates in each subdirectory
+# Subdir.mk.tmp
+# Makefile
+# and in toplevel
+# main.mk.tmp