diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index ce4723c..c69a4bc 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -182,12 +182,16 @@
 enum {
     HWC_DISPLAY_PRIMARY     = 0,
     HWC_DISPLAY_EXTERNAL    = 1,    // HDMI, DP, etc.
-    HWC_NUM_DISPLAY_TYPES
+    HWC_DISPLAY_VIRTUAL     = 2,
+
+    HWC_NUM_PHYSICAL_DISPLAY_TYPES = 2,
+    HWC_NUM_DISPLAY_TYPES          = 3,
 };
 
 enum {
     HWC_DISPLAY_PRIMARY_BIT     = 1 << HWC_DISPLAY_PRIMARY,
     HWC_DISPLAY_EXTERNAL_BIT    = 1 << HWC_DISPLAY_EXTERNAL,
+    HWC_DISPLAY_VIRTUAL_BIT     = 1 << HWC_DISPLAY_VIRTUAL,
 };
 
 /*****************************************************************************/