diff --git a/media/bufferpool/2.0/IAccessor.hal b/media/bufferpool/2.0/IAccessor.hal
index 07ea99d..bd70945 100644
--- a/media/bufferpool/2.0/IAccessor.hal
+++ b/media/bufferpool/2.0/IAccessor.hal
@@ -59,10 +59,14 @@
      *     to get shared buffers from the buffer pool.
      * @return connectionId Id of IConnection. The Id identifies
      *     sender and receiver in FMQ messages during buffer transfer.
-     * @return mqDesc FMQ descriptor. The descriptor can be used to
-     *     send/receive FMQ messages.
+     * @return toFmqDesc FMQ descriptor. The descriptor is used to
+     *     post buffer status messages.
+     * @return fromFmqDesc FMQ descriptor. The descriptor is used to
+     *     receive buffer invalidation messages from the buffer pool.
      */
     connect()
         generates (ResultStatus status, IConnection connection,
-                   int64_t connectionId, fmq_sync<BufferStatusMessage> mqDesc);
+                   int64_t connectionId,
+                   fmq_sync<BufferStatusMessage> toFmqDesc,
+                   fmq_sync<BufferInvalidationMessage> fromFmqDesc);
 };
diff --git a/media/bufferpool/2.0/types.hal b/media/bufferpool/2.0/types.hal
index d5b3937..7ce53b1 100644
--- a/media/bufferpool/2.0/types.hal
+++ b/media/bufferpool/2.0/types.hal
@@ -91,3 +91,19 @@
      */
     int64_t timestampUs;
 };
+
+/*
+ * Buffer pool sends a buffer invalidation message to clients in order to
+ * ensure fast reclamation of the buffers. Clients must free the invalidated
+ * buffers as soon as possible upon receiving the message.
+ */
+struct BufferInvalidationMessage {
+    /**
+     * Buffers from fromBufferId to toBufferId must be invalidated.
+     * Both of fromBufferId and toBufferId are inclusive.
+     * If fromBufferId > toBufferID, wrap happens. In that case
+     * the wrap is based on UINT32_MAX.
+     */
+    uint32_t fromBufferId;
+    uint32_t toBufferId;
+};