diff --git a/Shortcut-handling.md b/Shortcut-handling.md
index 07033a1..b536c79 100644
--- a/Shortcut-handling.md
+++ b/Shortcut-handling.md
@@ -65,4 +65,4 @@ When multiple keys generate the same keysym or when a single key generates multi
 like `Ctrl+a+a+b` are possible. Similarly, `Ctrl+a+b` might not work if multiple distinct keys generating
 `a` are pressed at the same time.
  
-
+When running sway under X11, holding a modifier (say, `Control_R`) long enough to activate key repeat and then pressing another key (say, `A`), may trigger the shortcut `Ctrl+Control_R+a` rather than `Ctrl+a` as likely expected.
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