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--- a/README.md
+++ b/README.md
@@ -1,6 +1,24 @@
 spaCy
 =====
 
-Fast, state-of-the-art natural language processing pipeline. Commercial licenses available, or use under AGPL.
 
 http://honnibal.github.io/spaCy
+
+Fast, state-of-the-art natural language processing pipeline. Commercial licenses available, or use under AGPL.
+
+Tested (and working) with:
+
+* CPython 2.7
+* CPython 3.4
+* OSX
+* Linux 
+
+Untested:
+
+* Windows
+
+Fails with:
+
+* PyPy 2.7
+* PyPy 3.4
+