diff --git a/pages/Configuring/Keywords.md b/pages/Configuring/Keywords.md
index 9670e43..8ffb7ba 100644
--- a/pages/Configuring/Keywords.md
+++ b/pages/Configuring/Keywords.md
@@ -110,7 +110,12 @@ Inside of it, put your config options. All options from the `input` category
 
 force_no_accel, follow_mouse, float_switch_override_focus
 
-For example:
+Properties that change names:
+```plain
+touchdevice:transform -> touch_transform
+```
+
+Example config section:
 
 ```ini
 device:ROYUAN Akko Multi-modes Keyboard-B {
diff --git a/pages/Configuring/Variables.md b/pages/Configuring/Variables.md
index 425ea5a..cb611a2 100644
--- a/pages/Configuring/Variables.md
+++ b/pages/Configuring/Variables.md
@@ -170,6 +170,14 @@ input {
 Doing `input:touchpad {` is **invalid**!
 {{< /hint >}}
 
+### Touchdevice
+
+_Subcategory `input:touchdevice:`_
+
+| name | description | type | default |
+|---|---|---|---|---|
+| transform | transform the input from touchdevices. The possible transformations are the same as [those of the monitors](../Monitors/#rotating-and-the-default-workspace) | int | 0 |
+
 ### Per-device input config
 
 Described [here](../Keywords#per-device-input-configs).