diff --git a/neuralnetworks/1.2/IExecutionCallback.hal b/neuralnetworks/1.2/IExecutionCallback.hal
index 667e0d6..47de1b6 100644
--- a/neuralnetworks/1.2/IExecutionCallback.hal
+++ b/neuralnetworks/1.2/IExecutionCallback.hal
@@ -18,6 +18,7 @@
 
 import @1.0::ErrorStatus;
 import @1.0::IExecutionCallback;
+import OutputShape;
 
 /**
  * IExecutionCallback must be used to return the error status result from an
@@ -39,10 +40,16 @@
      *               - DEVICE_UNAVAILABLE if driver is offline or busy
      *               - GENERAL_FAILURE if the asynchronous task resulted in an
      *                 unspecified error
-     *               - OUTPUT_INSUFFICIENT_SIZE if provided output buffer is
-     *                 not large enough to store the resultant values
+     *               - OUTPUT_INSUFFICIENT_SIZE if at least one output
+     *                 operand buffer is not large enough to store the
+     *                 corresponding output
      *               - INVALID_ARGUMENT if one of the input arguments to
      *                 prepareModel is invalid
+     * @param outputShapes A list of shape information of model output operands.
+     *                     The index into "outputShapes" corresponds with to index
+     *                     of the output operand in the Request outputs vector.
+     *                     outputShapes must be empty unless the status is either
+     *                     NONE or OUTPUT_INSUFFICIENT_SIZE.
      */
-    oneway notify_1_2(ErrorStatus status);
+    oneway notify_1_2(ErrorStatus status, vec<OutputShape> outputShapes);
 };