diff --git a/README.md b/README.md
index d494a0a..db5bd00 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@
 `peix` is a pure-python implementation of the [eix](https://github.com/vaeth/eix/) database format (https://github.com/vaeth/eix/blob/master/doc/eix-db.txt.in).
 It can be used to read the eix database file or as a library to create own protocols based on the format. 
 
+`peix` requires Python 3.4 or newer. It *may* work with previous versions of python, but it isn't supported.
+
 ## License
 
 `peix` is licensed under the GPL 3, see LICENSE.txt.