diff --git a/dgVoodoo-Upscale-Method.md b/dgVoodoo-Upscale-Method.md
index be4788d..29e16d8 100644
--- a/dgVoodoo-Upscale-Method.md
+++ b/dgVoodoo-Upscale-Method.md
@@ -29,6 +29,7 @@ For ability to have better upscale than Cxbx-Reloaded's upscale hack method. You
     * except dgVoodoo will take over and upscale of given resolution from **dgVoodoo.conf** file directly for you with the steps given above.
   * You do not need Cxbx-Reloaded's upscale hack method at all.
   * When stop emulation, you will need to restart cxbx.exe in order to start new emulation.
+    * dgVoodoo is the not the cause of the isssue. "Exclusive Fullscreen Mode" is not stable when alt+tab out or using hotkey to stop the emulation.
 
 ***