Document the doubletap_enable sysfs attribute for ThinkPad ACPI driver.

Signed-off-by: Vishnu Sankar <vishnuocv@gmail.com>
---
 .../admin-guide/laptops/thinkpad-acpi.rst     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
index 4ab0fef7d440..23bc84b0475d 100644
--- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
+++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
@@ -1521,6 +1521,26 @@ Currently 2 antenna types are supported as mentioned below:
 The property is read-only. If the platform doesn't have support the sysfs
 class is not created.
 
+doubletap_enable
+----------------
+
+sysfs: doubletap_enable
+
+Controls whether TrackPoint doubletap events are filtered out. Doubletap is a
+feature where quickly tapping the TrackPoint twice triggers a special function key event.
+
+The available commands are::
+
+                cat /sys/devices/platform/thinkpad_acpi/doubletap_enable
+                echo 1 | sudo tee /sys/devices/platform/thinkpad_acpi/doubletap_enable
+                echo 0 | sudo tee /sys/devices/platform/thinkpad_acpi/doubletap_enable
+
+Values:
+	* 1 - doubletap events are processed (default)
+	* 0 - doubletap events are filtered out (ignored)
+
+	This setting can also be toggled via the Fn+doubletap hotkey.
+
 Auxmac
 ------
 
-- 
2.51.0

On Sat, Dec 27, 2025 at 08:51:01AM +0900, Vishnu Sankar wrote:
> +Values:
> +	* 1 - doubletap events are processed (default)
> +	* 0 - doubletap events are filtered out (ignored)

Please separate the bullet list from "Values:" paragraph.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

Hi Bagas,

Thank you so much for the comments.

On Tue, Jan 20, 2026 at 9:04 AM Bagas Sanjaya <bagasdotme@gmail.com> wrote:
>
> On Sat, Dec 27, 2025 at 08:51:01AM +0900, Vishnu Sankar wrote:
> > +Values:
> > +     * 1 - doubletap events are processed (default)
> > +     * 0 - doubletap events are filtered out (ignored)
>
> Please separate the bullet list from "Values:" paragraph.
Acked.
I will update this in my V6.
>
> Thanks.
>
> --
> An old man doll... just what I always wanted! - Clara



-- 

Regards,

      Vishnu Sankar
     +817015150407 (Japan)