diff --git a/TopcomInterface/README.md b/TopcomInterface/README.md
index 1b50ce68..14e29ecf 100644
--- a/TopcomInterface/README.md
+++ b/TopcomInterface/README.md
@@ -1,5 +1,5 @@
 # TopcomInterface
-A `Gap4`-package which provides an interface to the software `topcom` (http://www.rambau.wm.uni-bayreuth.de/TOPCOM/).
+A `Gap4`-package which provides an interface to the software `topcom` (http://www.rambau.wm.uni-bayreuth.de/TOPCOM/). This interface requires `topcom` version 1.1.2. It may or may not work with newer version. Communication with older version is most likely not possibly with this software.
 
 
 ## Installation