diff --git a/README.md b/README.md
index addfb0131b..26f95d0c4c 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ For additional features
 
 Environments under Python 2.7.12 and 3.6.0 are tested.
 
-+ The master branch will work on both development and stable version of Chainer.
++ The master branch will work on both the stable version (v2) and the development version (v3).
 + For users using Chainer v1, please use version `0.4.11`, which can be installed by `pip install chainercv==0.4.11`. This branch is unmaintained.