diff --git a/docs/usage.md b/docs/usage.md
index 4c4a94d..8162ee3 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -84,17 +84,18 @@ Everything else on the screen is the main editor area `E`.
|-----------------------------------|---------------------------------------------------|
| mouse left button | place the selected block |
| mouse right button | rotate block |
-| middle buttons (scroll) | scroll the editor area |
-| Shift + scroll up/down | move the upper layers up and down |
-| Shift + scroll left | rotate the current block counter clock-wise |
-| Shift + scroll right | rotate the current block clock-wise |
-| Ctrl + scroll up/down | zoom in or out |
+| middle buttons (wheel) | scroll the editor area |
+| Shift + wheel up/down | move the upper layers up and down |
+| Shift + wheel left | rotate the current block counter clock-wise |
+| Shift + wheel right | rotate the current block clock-wise |
+| Ctrl + wheel up/down | zoom in or out |
### Keyboard Shortcuts
The GUI was designed in a way that you can use it without a mouse (actually it's faster to only use the keyboard in some cases).
Therefore the keyboard shortcuts may seem odd; the reason for the layout is that Space is the main "painter" key, and
-the other functions are arranged close to it. Having a key of the letter that the function starts with was a secondary importance.
+the other functions are arranged close to it depending how often they are needed. Having a key of the letter that the function
+starts with was a secondary importance.
Main editor window: