diff --git a/README.md b/README.md
index 4d5d075..35ccf14 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ Python 3.6.7 (default, Oct 22 2018, 11:32:17)
 [GCC 8.2.0] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> from prototype import *
->>> open97()
+>>> open97() # use open9a() for a 06cb:009a sensor
 >>>
 ```
 Or load previosly saved TLS session (see comments in [holdthedoor.py](holdthedoor.py))