diff --git a/src/content/docs/en/reference/cli-reference.mdx b/src/content/docs/en/reference/cli-reference.mdx
index 074443561a023..19c9eb64cc176 100644
--- a/src/content/docs/en/reference/cli-reference.mdx
+++ b/src/content/docs/en/reference/cli-reference.mdx
@@ -79,6 +79,7 @@ Global Flags
         --verbose  Enable verbose logging.
          --silent  Disable all logging.
         --version  Show the version number and exit.
+           --open  Open the app in the browser on server start.
            --help  Show this help message.
 ```
 
@@ -345,6 +346,10 @@ Use these flags to get information about the `astro` CLI.
 
 Prints the Astro version number and exits.
 
+### `--open`
+
+Automatically opens the app in the browser on server start.
+
 ### `--help`
 
 Prints the help message and exits.