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diff --git a/docs/feature_ps2_mouse.md b/docs/feature_ps2_mouse.md
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--- a/docs/feature_ps2_mouse.md
+++ b/docs/feature_ps2_mouse.md
@@ -266,6 +266,25 @@ To reverse the scroll axes you can put:
into config.h.
+### Rotate Mouse Axes :id=rotate-mouse-axes
+
+Transform the output of the device with a clockwise rotation of 90, 180, or 270
+degrees.
+
+When compensating for device orientation, rotate the output the same amount in
+the opposite direction. E.g. if the normal device orientation is considered to
+be North-facing, compensate as follows:
+
+```c
+#define PS2_MOUSE_ROTATE 270 /* Compensate for East-facing device orientation. */
+```
+```c
+#define PS2_MOUSE_ROTATE 180 /* Compensate for South-facing device orientation. */
+```
+```c
+#define PS2_MOUSE_ROTATE 90 /* Compensate for West-facing device orientation. */
+```
+
### Debug Settings :id=debug-settings
To debug the mouse, add `debug_mouse = true` or enable via bootmagic.