diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 0b20eba..d14d0c4 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -154,6 +154,15 @@
          that can be set by the user. -->
     <integer name="config_screenBrightnessDim">2</integer>
 
+    <!-- Minimum allowable screen brightness to use in a very dark room.
+         This value sets the floor for the darkest possible auto-brightness
+         adjustment.  It is expected to be somewhat less than the first entry in
+         config_autoBrightnessLcdBacklightValues so as to allow the user to have
+         some range of adjustment to dim the screen further than usual in very
+         dark rooms. The contents of the screen must still be clearly visible
+         in darkness (although they may not be visible in a bright room). -->
+    <integer name="config_screenBrightnessDark">2</integer>
+
     <!-- If this is true, the screen will come on when you unplug usb/power/whatever. -->
     <bool name="config_unplugTurnsOnScreen">true</bool>