diff --git a/README b/README
index 36b7ab0..f5f96ae 100644
--- a/README
+++ b/README
@@ -3,7 +3,11 @@ libopenssh
 
 turn openssh into a library
 
-ssh	a copy of openbsd src/usr.bin/ssh
-regress	a copy of openbsd src/regress/usr.bin/ssh
+ssh		a copy of openbsd src/usr.bin/ssh
+regress		a copy of openbsd src/regress/usr.bin/ssh
+
+diff against vanilla openssh:
+
+% cd ssh && cvs -qd anoncvs@anoncvs1.ca.openbsd.org:/cvs diff -u
 
 -m