diff --git a/include/hardware/hwcomposer.h b/include/hardware/hwcomposer.h
index 3dfb4fd..aa466b3 100644
--- a/include/hardware/hwcomposer.h
+++ b/include/hardware/hwcomposer.h
@@ -299,8 +299,29 @@
              */
             uint8_t planeAlpha;
 
-            /* reserved for future use */
+            /* Pad to 32 bits */
             uint8_t _pad[3];
+
+            /*
+             * Availability: HWC_DEVICE_API_VERSION_1_5
+             *
+             * This defines the region of the source buffer that has been
+             * modified since the last frame.
+             *
+             * If surfaceDamage.numRects > 0, then it may be assumed that any
+             * portion of the source buffer not covered by one of the rects has
+             * not been modified this frame. If surfaceDamage.numRects == 0,
+             * then the whole source buffer must be treated as if it had been
+             * modified.
+             *
+             * If the layer's contents are not modified relative to the prior
+             * prepare/set cycle, surfaceDamage will contain exactly one empty
+             * rect ([0, 0, 0, 0]).
+             *
+             * The damage rects are relative to the pre-transformed buffer, and
+             * their origin is the top-left corner.
+             */
+            hwc_region_t surfaceDamage;
         };
     };
 
@@ -309,13 +330,13 @@
      * For 64-bit mode, this struct is 120 bytes (and 8-byte aligned), and needs
      * to be padded as such to maintain binary compatibility.
      */
-    uint8_t reserved[120 - 96];
+    uint8_t reserved[120 - 112];
 #else
     /*
      * For 32-bit mode, this struct is 96 bytes, and needs to be padded as such
      * to maintain binary compatibility.
      */
-    uint8_t reserved[96 - 76];
+    uint8_t reserved[96 - 84];
 #endif
 
 } hwc_layer_1_t;
diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index 9a52436..e650bd2 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -37,6 +37,7 @@
 #define HWC_DEVICE_API_VERSION_1_2  HARDWARE_DEVICE_API_VERSION_2(1, 2, HWC_HEADER_VERSION)
 #define HWC_DEVICE_API_VERSION_1_3  HARDWARE_DEVICE_API_VERSION_2(1, 3, HWC_HEADER_VERSION)
 #define HWC_DEVICE_API_VERSION_1_4  HARDWARE_DEVICE_API_VERSION_2(1, 4, HWC_HEADER_VERSION)
+#define HWC_DEVICE_API_VERSION_1_5  HARDWARE_DEVICE_API_VERSION_2(1, 5, HWC_HEADER_VERSION)
 
 enum {
     /* hwc_composer_device_t::set failed in EGL */