diff --git a/README.md b/README.md
index a2ba7f9..bd2b22e 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ version 2.0 of this package:
 
 ## Release notes
 
-### 2.1.0 (dev)
+### 2.1.0 (2017-09-04)
 
 * Updated the MediaWiki entry point to use the extension.json format.
 * Added code sniffers for JavaScript as well as PHP.