diff --git a/src/event.rs b/src/event.rs
index ee2a2eb..8df56d4 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -337,6 +337,7 @@ bitflags! {
         const SHIFT = 0b0000_0001;
         const CONTROL = 0b0000_0010;
         const ALT = 0b0000_0100;
+        const NONE = 0b0000_0000;
     }
 }