diff --git a/usr.sbin/sup/README b/usr.sbin/sup/README
new file mode 100644
index 000000000000..e8954a2ac08f
--- /dev/null
+++ b/usr.sbin/sup/README
@@ -0,0 +1,10 @@
+$NetBSD: README,v 1.1 1997/10/07 01:33:30 thorpej Exp $
+
+This is the CMU sup system, converted to use a NetBSD Makefile
+infrastructure.  To build the sup system for another operating
+system, go into the "source" subdirectory, and use the Makefile
+provided there.
+
+	-- Jason R. Thorpe <thorpej@NetBSD.ORG>
+	   October 6, 1997
+