diff --git a/README b/README
index ed197a8..a6a89d2 100644
--- a/README
+++ b/README
@@ -386,6 +386,11 @@ If possible use screen (as part of Cygwin).
 screen /dev/ttyS3
 (Might be a different file, ttyS0, ttyACM0, ttyUSB0, etc.)
 
+Gnu screen doesn't seem to echo all the characters (it works though).
+I believe it's a problem with stty, but I don't know how to fix it...
+
+putty works well when using DTR/DSR or RTS/CTS flow control.
+
 
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 | Mac OS X |