diff --git a/Settings.md b/Settings.md
index a71b7c4..700dfac 100644
--- a/Settings.md
+++ b/Settings.md
@@ -65,6 +65,16 @@ Note that it takes about a second to save the time when the Save button is press
 This provides an app for the calibration of the touch screen and alignment by following on screen instruction.
 
 You have to keep pressed for at least a second on each target for the app to guess the touch area correctly and show next target on release.
+
+# Touchscreen Threshold 
+The touchscreen’s resistance detection layer can be eventually worm out (it’s inside the soft layer so use screen protector won’t slow it down) by using it, or it’s originally bad quality, so you maybe need to tune the threshold if you are having issue touch an area, or some region are kept pressing even if you are not pressing it (which causes the black light keeps on forever because the device think you are keep touching the screen)
+
+In the best case the threshold should be 1, but considering the most case that the layer already kind of damaged, we default it to 32.
+
+If you are having issues listed above, just press Auto detect, and follow the guide, and it will automatically tune to a value that good for your device.
+
+When auto detecting, don’t touch the screen, until count down finished. otherwise it will give you a bad value. But don’t worry if you mistakenly touched, just need to start over and nothing bad would happen.
+
 ## App Settings
 Settings for each app are saved in corresponding .ini files in the /SETTINGS folder to maintain persistence, if a formatted SD card is installed.  An updated .ini file is saved whenever the app is closed.  To reset an app to default settings, the corresponding .ini file may be safely deleted and a new file will be created automatically when the app is subsequently executed.  Alternatively, individual lines in the file may be deleted to reset only a subset of application settings.  For debug purposes, note that some additional configuration settings may be found in the .ini file that are not configurable in the app itself.