diff --git a/README.txt b/README.txt
index 620dd8c..5a198c9 100644
--- a/README.txt
+++ b/README.txt
@@ -6,4 +6,9 @@ The files called lib_* shouldn't be touched unless you really know what you are
 
 Random tables are encoded as simple text files in the tables folder. Look for examples and replicate.
 
-Systems are clunkily described at the moment. I'll get a fix for this soon enough. 
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+Systems are clunkily described at the moment. I'll get a fix for this soon enough. 
+
+This code was written using Python 2.7. It probably will complain with Python 3.X. I hope that I cared 
+enough to test the code and probably will soon.
+
+Christian
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