diff --git a/docs/api/system-preferences.md b/docs/api/system-preferences.md
index 610513e6d3f9..54d3ea8d6a21 100644
--- a/docs/api/system-preferences.md
+++ b/docs/api/system-preferences.md
@@ -141,7 +141,7 @@ This API uses `NSUserDefaults` on macOS. Some popular `key` and `type`s are:
 
 ### `systemPreferences.isAeroGlassEnabled()` _Windows_
 
-This method returns `true` if [DWM composition][dwm-composition] (Aero Glass) is
+Returns `Boolean` - `true` if [DWM composition][dwm-composition] (Aero Glass) is
 enabled, and `false` otherwise.
 
 An example of using it to determine if you should create a transparent window or