Tweak optional syntax

diff --git a/docs/api/app.md b/docs/api/app.md
index 6e159d1dc602ab387d2a811006d22ecb9c55fc0d..25a609cb24ae4e658a2db3b98bfc001339e7f93b 100644 (file)
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -401,7 +401,7 @@ You can request the following paths by the name:
 * `videos` Directory for a user's videos.
 * `pepperFlashSystemPlugin`  Full path to the system version of the Pepper Flash plugin.
 
-### `app.getFileIcon(path, [options], callback)`
+### `app.getFileIcon(path[, options], callback)`
 
 * `path` String
 * `options` Object (optional)