Update sway-input.5.scd

1 files changed, 10 insertions, 5 deletions

diff --git a/sway/sway-input.5.scd b/sway/sway-input.5.scd
index 8a1f2700..442311bb 100644
--- a/sway/sway-input.5.scd
+++ b/sway/sway-input.5.scd
@@ -121,11 +121,16 @@ The following commands may only be used in the configuration file.
 
 *input* <identifier> map_from_region <X1xY1> <X2xY2>
         Ignores inputs from this device that do not occur within the specified
-        region. Can be in millimeters (e.g. 10x20mm 20x40mm) or in terms of 0..1
-        (e.g. 0.5x0.5 0.7x0.7). Not all devices support millimeters. Only meaningful
-        if the device is not a keyboard and provides events in absolute terms (such
-        as a drawing tablet or touch screen - most pointers provide events relative
-        to the previous frame).
+        region. Can be in millimeters (e.g. 10x20mm 20x40mm) or the fraction of the
+        full available space in terms of 0..1 (e.g. 0.5x0.5 0.7x0.7). Not all
+        devices support millimeters. Only meaningful if the device is not a
+        keyboard and provides events in absolute terms (such as a drawing tablet
+        or touch screen - most pointers provide events relative to the previous
+        frame).
+
+        Commonly used to maintain the aspect ratio of the input device and screen.
+        Cropping a 16:10 input region to match a 16:9 display can use 0x0 1x0.9 as
+        the argument.
 
 ## LIBINPUT CONFIGURATION