diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index ca303668..84b4ddc4 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -182,6 +182,7 @@ _Details coming soon ..._
 ## Known issues
 
 1. **When using multiple screens**, if you move the application to a secondary screen, and later switch to using only the primary screen, the GUI will open off-screen. The remedy is to delete the `preferences.json` file created by the application before running the application again.
+2. **If you minimize the Help Window** and then run the `help` command (or use the `Help` menu, or the keyboard shortcut `F1`) again, the original Help Window will remain minimized, and no new Help Window will appear. The remedy is to manually restore the minimized Help Window.
 
 --------------------------------------------------------------------------------------------------------------------