diff --git a/neuralnetworks/1.2/IPreparedModel.hal b/neuralnetworks/1.2/IPreparedModel.hal
index ba16334..f3508fe 100644
--- a/neuralnetworks/1.2/IPreparedModel.hal
+++ b/neuralnetworks/1.2/IPreparedModel.hal
@@ -54,11 +54,14 @@
      * must not change the content of any of the data objects corresponding to
      * 'request' inputs.
      *
-     * If the prepared model was prepared from a model wherein all
-     * tensor operands have fully specified dimensions, and the inputs
-     * to the function are valid, then the execution should launch
-     * and complete successfully (ErrorStatus::NONE). There must be
-     * no failure unless the device itself is in a bad state.
+     * If the prepared model was prepared from a model wherein all tensor
+     * operands have fully specified dimensions, and the inputs to the function
+     * are valid, then:
+     * - the execution should launch successfully (ErrorStatus::NONE): There
+     *   must be no failure unless the device itself is in a bad state.
+     * - if at execution time every operation's input operands have legal
+     *   values, the execution should complete successfully (ErrorStatus::NONE):
+     *   There must be no failure unless the device itself is in a bad state.
      *
      * Any number of calls to the execute, execute_1_2, and executeSynchronously
      * functions, in any combination, may be made concurrently, even on the same
@@ -105,8 +108,9 @@
      *
      * If the prepared model was prepared from a model wherein all tensor
      * operands have fully specified dimensions, and the inputs to the function
-     * are valid, then the execution should complete successfully
-     * (ErrorStatus::NONE). There must be no failure unless the device itself is
+     * are valid, and at execution time every operation's input operands have
+     * legal values, then the execution should complete successfully
+     * (ErrorStatus::NONE): There must be no failure unless the device itself is
      * in a bad state.
      *
      * Any number of calls to the execute, execute_1_2, and executeSynchronously
@@ -145,6 +149,13 @@
      * Configure a Burst object used to execute multiple inferences on a
      * prepared model in rapid succession.
      *
+     * If the prepared model was prepared from a model wherein all tensor
+     * operands have fully specified dimensions, and a valid serialized Request
+     * is sent to the Burst for execution, and at execution time every
+     * operation's input operands have legal values, then the execution should
+     * complete successfully (ErrorStatus::NONE): There must be no failure
+     * unless the device itself is in a bad state.
+     *
      * @param callback A callback object used to retrieve memory resources
      *                 corresponding to a unique identifiers ("slots").
      * @param requestChannel Used by the client to send a serialized Request to