diff --git a/src/python/grpcio/README.rst b/src/python/grpcio/README.rst
index 014a6491dad16c1c5d22a32c60532315f4214d14..28a27145682e5f1df4d6311b376bcb003c6a86c2 100644
--- a/src/python/grpcio/README.rst
+++ b/src/python/grpcio/README.rst
@@ -6,7 +6,7 @@ Package for gRPC Python.
 Installation
 ------------
 
-gRPC Python is available for Linux, Mac OS X, and Windows.
+gRPC Python is available for Linux, macOS, and Windows.
 
 From PyPI
 ~~~~~~~~~