diff --git a/README.md b/README.md
index dc049ec..b5cb60d 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Typical minimal usage looks something like this:
 // Somewhere in your app set-up code:
 $server = new Taproot\IndieAuth\Server([
 	// A secret key, >= 64 characters long.
-	'secret' => APP_INDIEAUTH_SECRET,
+	'secret' => YOUR_APP_INDIEAUTH_SECRET,
 
 	// A path to store token data, or an object implementing TokenStorageInterface.
 	'tokenStorage' => '/../data/auth_tokens/',