diff --git a/comet/overlay/frameworks/base/core/res/res/values/config.xml b/comet/overlay/frameworks/base/core/res/res/values/config.xml
index 4b1a78f..b06ef42 100644
--- a/comet/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/comet/overlay/frameworks/base/core/res/res/values/config.xml
@@ -284,4 +284,9 @@
     <!-- Package name providing GNSS location support. Used only when
          config_useGnssHardwareProvider is false. -->
     <string name="config_gnssLocationProviderPackageName" translatable="false">com.google.android.gms</string>
+
+    <!-- Corners radius for activity presented the letterbox mode. Values < 0 enable rounded
+         corners with radius equal to min between device bottom corner radii. Default 0 value turns
+         off rounded corners logic in LetterboxUiController. Values are in pixel. -->
+    <integer name="config_letterboxActivityCornersRadius">88</integer>
 </resources>