diff --git a/README.md b/README.md
index 5c0adf33a1..2e3eb3bf64 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # [GitHub Desktop](https://desktop.github.com)
 
-[GitHub Desktop](https://desktop.github.com/) is an open source [Electron](https://www.electronjs.org/)-based
+[GitHub Desktop](https://desktop.github.com/) is an open-source [Electron](https://www.electronjs.org/)-based
 GitHub app. It is written in [TypeScript](https://www.typescriptlang.org) and
 uses [React](https://reactjs.org/).