diff --git a/ubb-patgen/README b/ubb-patgen/README
index 22eee31..4b4d85a 100644
--- a/ubb-patgen/README
+++ b/ubb-patgen/README
@@ -125,6 +125,8 @@ and so are comments beginning with #:
 # send two characters in RS232 format
 0 00010010 1	# "H"
 0 10010110 1	# "i"
+0 10000100 1	# "!"
+0 10110000 1	# CR
 1		# return to idle (high)
 EOF
 # ubb-patgen -f 115.2k pattern-file