diff --git a/docs/api/browser-window.md b/docs/api/browser-window.md
index 4e46134852fa..86b06008449d 100644
--- a/docs/api/browser-window.md
+++ b/docs/api/browser-window.md
@@ -994,7 +994,9 @@ The `flags` is an array that can include following `String`s:
   * `height` Integer - height of region
 
 Sets the region of the window to show as the thumbnail image displayed when
-hovering over the window in the taskbar.
+hovering over the window in the taskbar. You can reset the thumbnail to be
+the entire window by specifying an empty region:
+`{x: 0, y: 0, width: 0, height: 0}`.
 
 #### `win.showDefinitionForSelection()` _macOS_
 
diff --git a/vendor/brightray b/vendor/brightray
index 5946ef9e2303..91abdb01a182 160000
--- a/vendor/brightray
+++ b/vendor/brightray
@@ -1 +1 @@
-Subproject commit 5946ef9e2303dd9d870410c412ae775da43f03ea
+Subproject commit 91abdb01a1825c12522fd5fc2349a7ba9a091a48