diff --git a/README.md b/README.md
index b022879..97d7828 100644
--- a/README.md
+++ b/README.md
@@ -14,4 +14,10 @@ These libraries are under GNU GPL v3. See [license](LICENSE) for more details.
 
 This program requires Python interpretator and access to Android API. Access to Android API is provided by the API addon and the termux-api package.
 
-Once installed, just run the sms.py script with the python interpretator and connect a browser to phone, on port 8080.
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+Once installed, just run the sms.py script with the python interpretator and connect a browser to phone, on port 8080.
+
+# Note on security
+
+This webserver listen on HTTP, so the traffic between phone and browser is in plain text.
+
+The webserver will only serve the first IP (v4 ou v6) that connect to it, all the other will recieve a 403 error. The server log will show that the server locks on a specific IP when the first client will connect.
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