add paragraph to sway-input man page

The added paragraph describes how to get button identifier and set it in
config.

1 files changed, 5 insertions, 0 deletions

diff --git a/sway/sway-input.5.scd b/sway/sway-input.5.scd
index cf7a6385..4bc66394 100644
--- a/sway/sway-input.5.scd
+++ b/sway/sway-input.5.scd
@@ -92,6 +92,11 @@ For more information on these xkb configuration options, see
 *input* <identifier> scroll\_method none|two\_finger|edge|on\_button\_down
         Changes the scroll method for the specified input device.
 
+*input* <identifier> scroll\_button <button\_identifier>
+        Sets button used for scroll\_method on\_button\_down. The button identifier
+        can be obtained from `libinput debug-events`.
+        If set to 0, it disables the scroll\_button on\_button\_down.
+
 *input* <identifier> tap enabled|disabled
         Enables or disables tap for specified input device.