diff --git a/README.md b/README.md
index d065f4b..9e9882c 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,6 @@ Copyright (c) 2016 Mengdi Gao, This software is licensed under the [MIT License]
 
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-\* IKEv2 protocol requires iOS 8 or later, Mac OS X 10.11 El Capitan is supported as well.
+\* IKEv2 protocol requires iOS 8 or later, macOS X 10.11 El Capitan or later.
 
 \* Install for **iOS 8 or later** or when your AirDrop fails: Send an E-mail to your iOS device with the `.mobileconfig` file as attachment, then tap the attachment to bring up and finish the **Install Profile** screen.