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-rw-r--r--docs/how_keyboards_work.md6
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/how_keyboards_work.md b/docs/how_keyboards_work.md
index 5697a21872..bbd22a2788 100644
--- a/docs/how_keyboards_work.md
+++ b/docs/how_keyboards_work.md
@@ -33,7 +33,11 @@ The firmware does not send actual letters or characters, but only scancodes.
Thus, by modifying the firmware, you can only modify what scancode is sent over
USB for a given key.
-## 3. What the Operating System Does
+## 3. What the Event Input/Kernel Does
+
+The *scancode* is mapped to a *keycode* dependent on the keyboard [60-keyboard.hwdb at Master](https://github.com/systemd/systemd/blob/master/hwdb/60-keyboard.hwdb). Without this mapping, the operating system will not receive a valid keycode and will be unable to do anything useful with that key press.
+
+## 4. What the Operating System Does
Once the keycode reaches the operating system, a piece of software has to have
it match an actual character thanks to a keyboard layout. For example, if your