diff --git a/README.md b/README.md
index bbde090..fb382e1 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,8 @@ in the same spirit as — and yet conspicuously missing from —
 **[Full and extensive docs are available on Read The Docs.][rtd]** See
 what's new [by checking the CHANGELOG][changelog].
 
-Boltons is tested against Python 2.6, 2.7, 3.4, 3.5, and PyPy.
+Boltons is tested against Python 2.6, 2.7, 3.3, 3.4, 3.5, 3.6,
+3.7-dev (aka _nightly_), and PyPy.
 
 [stdlib]: https://docs.python.org/2.7/library/index.html
 [rtd]: https://boltons.readthedocs.org/en/latest/