diff --git a/requirements.txt b/requirements.txt
index 6eadd74..759636a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
 Twisted>=12.0.0
+
+For ambe_audio
 https://pypi.python.org/packages/source/b/bitstring/bitstring-3.1.3.zip