diff --git a/active/Win32/Window_and_Application_API_Spec.md b/active/Win32/Window_and_Application_API_Spec.md
index 876f649be..f78817980 100644
--- a/active/Win32/Window_and_Application_API_Spec.md
+++ b/active/Win32/Window_and_Application_API_Spec.md
@@ -482,9 +482,9 @@ Contains the argument returned by a window size change event.
     public bool Handled { get; set; };
     ```
 
-- WindowSizeChangedEventArgs.Visible: Gets the new size of the window in units of effective (view) pixels.
+- WindowSizeChangedEventArgs.Size: Gets the new size of the window in units of effective (view) pixels.
     ```CS
-    public Size Visible { get; } 
+    public Size Size { get; } 
     ```