diff --git a/README.md b/README.md
index 32ccb95..8c2889f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # Gittle - Pythonic Git for Humans
 
 Gittle is a high-level pure-python git library.
-It builds upon dulwich which provides most of the low-level machinery
+It builds upon dulwich which provides most of the low-level machinery.
+Compatible with Python 2.7; not yet 3+.
 
 ## Install it