diff --git a/README.md b/README.md
index 5450024..1e6cfac 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ Software required:
 
 * An operating system (tested on Debian, CentOS, FreeBSD and Windows 7)
 * Python 2.5+
-* Twisted 8.0+
+* Twisted 8.0 to 15.1.0
 * PyCrypto
 * Zope Interface