diff --git a/coral/overlay/frameworks/base/core/res/res/values/config.xml b/coral/overlay/frameworks/base/core/res/res/values/config.xml
index 2de8073..47e653c 100755
--- a/coral/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/coral/overlay/frameworks/base/core/res/res/values/config.xml
@@ -175,4 +175,7 @@
     <integer-array name="config_ambientThresholdsOfPeakRefreshRate">
         <item>63</item>
     </integer-array>
+
+    <!-- default refresh rate in the zone defined by birghtness and ambient thresholds -->
+    <integer name="config_defaultRefreshRateInZone">90</integer>
 </resources>
diff --git a/flame/overlay/frameworks/base/core/res/res/values/config.xml b/flame/overlay/frameworks/base/core/res/res/values/config.xml
index 2f67639..02260a0 100755
--- a/flame/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/flame/overlay/frameworks/base/core/res/res/values/config.xml
@@ -175,4 +175,7 @@
     <integer-array name="config_ambientThresholdsOfPeakRefreshRate">
         <item>63</item>
     </integer-array>
+
+    <!-- default refresh rate in the zone defined by birghtness and ambient thresholds -->
+    <integer name="config_defaultRefreshRateInZone">60</integer>
 </resources>