diff --git a/README.md b/README.md
index 18b9237..c3f09c8 100644
--- a/README.md
+++ b/README.md
@@ -54,9 +54,9 @@ Support for PyTorch v0.3.x can be found in [v0.2](https://github.com/ShangtongZh
 Prediction is sampled after 110K iterations, and I only implemented one-step training
 
 # Dependency
-* MacOS 10.12,  CentO/S 6.8 and Ubuntu 16.04
+* MacOS 10.12,  CentO/S 6.8 or Ubuntu 16.04
 * PyTorch v0.4.0
-* Python 3.6 (recommended), 3.5 and 2.7 
+* Python 3.6 (recommended), 3.5 or 2.7 
 * Core dependencies: `pip install -r requirements.txt`
 * Optional: [Roboschool](https://github.com/openai/roboschool), [DeepMind Control Suite](https://github.com/deepmind/dm_control)+[DMControl2Gym](dm_control2gym)