diff --git a/Known-issues.md b/Known-issues.md
index c9c0340..19274f9 100644
--- a/Known-issues.md
+++ b/Known-issues.md
@@ -263,6 +263,7 @@ If running TDJ in windowed mode with subscreen in a separate window (`-w` on, `-
  * If your touchscreen is not 16:9, then the game will not fit perfectly, and touch coordinates will be off. You **MUST ENSURE** to turn on `-wintouch` option to fix this. [Issue 697](https://github.com/spice2x/spice2x.github.io/issues/697).
     * Because you disabled raw input, you're now using Windows touch API, it may end up being less responsive, prone to double-taps being ignored, and swipes delayed. You should look up online how to disable those.
     * For this reason, it's recommended that you stick to a 16:9 monitor.
+ * If you're using a touch screen to play, it must be set as the primary monitor.
 
 ### Graphics issues
 * Jubeat is unique in that it's the only OpenGL game.