diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index 0131bc5..9c7d790 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -192,6 +192,10 @@
      */
     HWC_DISPLAY_DPI_X                       = 4,
     HWC_DISPLAY_DPI_Y                       = 5,
+
+    /* Indicates which of the vendor-defined color transforms is provided by
+     * this configuration. */
+    HWC_DISPLAY_COLOR_TRANSFORM             = 6,
 };
 
 /* Allowed events for hwc_methods::eventControl() */
diff --git a/include/hardware/power.h b/include/hardware/power.h
index 084cba8..8825325 100644
--- a/include/hardware/power.h
+++ b/include/hardware/power.h
@@ -117,7 +117,8 @@
      *     User is interacting with the device, for example, touchscreen
      *     events are incoming.  CPU and GPU load may be expected soon,
      *     and it may be appropriate to raise speeds of CPU, memory bus,
-     *     etc.  The data parameter is unused.
+     *     etc.  The data parameter is the estimated length of the interaction
+     *     in milliseconds, or 0 if unknown.
      *
      * POWER_HINT_LOW_POWER
      *