diff --git a/docs/api/app.md b/docs/api/app.md
index ca8b89b912067..3173f27ffabb4 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -390,8 +390,10 @@ Returns:
 * `workingDirectory` String - The second instance's working directory
 
 This event will be emitted inside the primary instance of your application
-when a second instance has been executed. `argv` is an Array of the second instance's
-command line arguments, and `workingDirectory` is its current working directory. Usually
+when a second instance has been executed and calls `app.requestSingleInstanceLock()`.
+
+`argv` is an Array of the second instance's command line arguments,
+and `workingDirectory` is its current working directory. Usually
 applications respond to this by making their primary window focused and
 non-minimized.