diff --git a/Modem-control-using-KISS-protocol-extension.md b/Modem-control-using-KISS-protocol-extension.md
index 2f335fa..300b127 100644
--- a/Modem-control-using-KISS-protocol-extension.md
+++ b/Modem-control-using-KISS-protocol-extension.md
@@ -1,5 +1,5 @@
 When `EnableKissExtensions` configuration parameter is set to `true` modem will be able to handle 
-- SetHardware KISS command 6 for setting modem parameters
+- SetHardware KISS command 6 for setting modem parameters, note, that it is not compatible with classical KISS format
 - will send event about signal level with KISS command 7
 - reboot when command 8 is received