diff --git a/mercure.rst b/mercure.rst
index 28a85451a5a..7386b58a263 100644
--- a/mercure.rst
+++ b/mercure.rst
@@ -71,7 +71,7 @@ Run the following command to start it:
 
 .. code-block:: terminal
 
-    $ JWT_KEY='aVerySecretKey' ADDR='localhost:3000' ALLOW_ANONYMOUS=1 ./mercure
+    $ JWT_KEY='aVerySecretKey' ADDR='localhost:3000' ALLOW_ANONYMOUS=1 CORS_ALLOWED_ORIGINS=* ./mercure
 
 .. note::