diff --git a/docs/api/app.md b/docs/api/app.md
index 9076cd7d4f80..740da22d82ee 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -386,6 +386,7 @@ app.on('session-created', (event, session) => {
 
 Returns:
 
+* `event` Event
 * `argv` String[] - An array of the second instance's command line arguments
 * `workingDirectory` String - The second instance's working directory