diff --git a/Hardware:-Keyboard.md b/Hardware:-Keyboard.md
index fa4affe..f2542a9 100644
--- a/Hardware:-Keyboard.md
+++ b/Hardware:-Keyboard.md
@@ -12,6 +12,6 @@ Hardware ID: `0x0004`
 | `0` | `CLEAR` | `0 kJ` | Clear the keypress buffer |
 | `1` | `FETCH_KEY` | `0 kJ` | Reads the oldest keycode from the buffer into the B register and remove it|
 
-
+The `FETCH_KEY` operation will return `0` when the buffer is empty.
 
 Keycodes: [keycode.info](http://keycode.info/)
\ No newline at end of file