diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index a4c51e4..55cbc3f 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -44,4 +44,10 @@
     <!-- Should the pinner service pin the Home application? -->
     <bool name="config_pinnerHomeApp">true</bool>
 
+    <!-- Flag indicating whether the surface flinger has limited
+         alpha compositing functionality in hardware.  If set, the window
+         manager will disable alpha trasformation in animations where not
+         strictly needed. -->
+    <bool name="config_sf_limitedAlpha">true</bool>
+
 </resources>