diff --git a/automotive/evs/1.1/IEvsCamera.hal b/automotive/evs/1.1/IEvsCamera.hal
index 975b6c6..acc2eec 100644
--- a/automotive/evs/1.1/IEvsCamera.hal
+++ b/automotive/evs/1.1/IEvsCamera.hal
@@ -51,7 +51,7 @@
     resumeVideoStream() generates (EvsResult result);
 
     /**
-     * Returns a frame that was delivered by to the IEvsCameraStream.
+     * Returns frame that were delivered by to the IEvsCameraStream.
      *
      * When done consuming a frame delivered to the IEvsCameraStream
      * interface, it must be returned to the IEvsCamera for reuse.
@@ -59,10 +59,10 @@
      * as one), and if the supply is exhausted, no further frames may be
      * delivered until a buffer is returned.
      *
-     * @param  buffer A buffer to be returned.
+     * @param  buffer Buffers to be returned.
      * @return result Return EvsResult::OK if this call is successful.
      */
-    doneWithFrame_1_1(BufferDesc buffer) generates (EvsResult result);
+    doneWithFrame_1_1(vec<BufferDesc> buffer) generates (EvsResult result);
 
     /**
      * Requests to be a master client.
@@ -127,8 +127,13 @@
         generates (int32_t min, int32_t max, int32_t step);
 
     /**
-     * Requests to set a camera parameter.  Only a request from the master
-     * client will be processed successfully.
+     * Requests to set a camera parameter.
+     *
+     * Only a request from the master client will be processed successfully.
+     * When this method is called on a logical camera device, it will be forwarded
+     * to each physical device and, if it fails to program any physical device,
+     * it will return an error code with the same number of effective values as
+     * the number of backing camera devices.
      *
      * @param  id             The identifier of camera parameter, CameraParam enum.
      *         value          A desired parameter value.
@@ -138,21 +143,22 @@
      *                        parameter is not supported.
      *                        EvsResult::UNDERLYING_SERVICE_ERROR if it fails to
      *                        program a value by any other reason.
-     *         effectiveValue A programmed parameter value.  This may differ
+     *         effectiveValue Programmed parameter values.  This may differ
      *                        from what the client gives if, for example, the
      *                        driver does not support a target parameter.
      */
     setIntParameter(CameraParam id, int32_t value)
-        generates (EvsResult result, int32_t effectiveValue);
+        generates (EvsResult result, vec<int32_t> effectiveValue);
 
     /**
-     * Retrieves a value of given camera parameter.
+     * Retrieves values of given camera parameter.
      *
      * @param  id     The identifier of camera parameter, CameraParam enum.
      * @return result EvsResult::OK if it succeeds to read a parameter.
      *                EvsResult::INVALID_ARG if either a requested parameter is
      *                not supported.
-     *         value  A value of requested camera parameter.
+     *         value  Values of requested camera parameter, the same number of
+     *                values as backing camera devices.
      */
-    getIntParameter(CameraParam id) generates(EvsResult result, int32_t value);
+    getIntParameter(CameraParam id) generates(EvsResult result, vec<int32_t> value);
 };