diff --git a/README b/README
index 802ca78..f3eb7c9 100644
--- a/README
+++ b/README
@@ -9,6 +9,7 @@ should work on every kernel version which is supported by libusb and supports
 ppdev. It was written against impact from ISE Webpack 9.1SP1 and tested with
 the following software:
 
+ * ISE 13.1
  * ISE 12.1
  * ISE Webpack 11.1
  * ISE Webpack 10.1