diff --git a/README.md b/README.md
index 7b1eece..6318b4f 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,12 @@ just switch your wireless off and on. Sshuttle makes the
 kernel setting it changes permanent, so this won't happen
 again, even after a reboot.
 
+Required Software
+=================
+
+ - You need PyXAPI, available here:
+   http://www.pps.univ-paris-diderot.fr/~ylg/PyXAPI/
+
 
 sshuttle: where transparent proxy meets VPN meets ssh
 =====================================================