diff --git a/README b/README
index 27651e7c84a46efe343e60aa19ddb22de4d9c4f5..e6d65b55c136fe1f77e127e7d3ec18698d6d7f44 100644
--- a/README
+++ b/README
@@ -29,3 +29,16 @@ In short,
 
 guppy works with Python 3 only. 
 
+=== Notes ===
+
+1) For debugging, to make a unix OS user lose internet connection, run
+
+# iptables -A OUTPUT -o eth0 -m owner --uid-owner 1002 -j DROP
+
+To reset, 
+
+# iptables --flush
+
+
+
+EOF