diff --git a/overlay/FrameworksResTarget/res/values/config.xml b/overlay/FrameworksResTarget/res/values/config.xml
index b3db408..7c3c11e 100644
--- a/overlay/FrameworksResTarget/res/values/config.xml
+++ b/overlay/FrameworksResTarget/res/values/config.xml
@@ -151,4 +151,8 @@
     <bool name="config_dozePulseProximity">true</bool>
     <bool name="config_deviceHaveWakeUpProximity">true</bool>
 
+    <!-- The maximum range of gamma adjustment possible using the screen
+         auto-brightness adjustment setting. -->
+    <fraction name="config_autoBrightnessAdjustmentMaxGamma">150%</fraction>
+
 </resources>