diff --git a/index.bs b/index.bs
index 9978612..c9de935 100644
--- a/index.bs
+++ b/index.bs
@@ -5791,7 +5791,8 @@ bluetooth.SimulateCharacteristicResponseParameters = {
    serviceUuid: bluetooth.BluetoothUuid,
    characteristicUuid: bluetooth.BluetoothUuid,
    type: "read" / "write" / "subscribe-to-notifications" / "unsubscribe-from-notifications",
-   code: uint
+   code: uint,
+   ? data: [ * uint ]
 }
 </pre>
 
@@ -5803,7 +5804,7 @@ Issue: TODO: Finish the algorithm of bluetooth.simulateCharacteristicResponse.
 
 <div class="example">
 A [=local end=] could simulate a response of success (error code `0x00` according to <a>Error Response</a>)
-for a characteristic read operation by sending the following message:
+with data for a characteristic read operation by sending the following message:
 
 <pre highlight="json">
 {
@@ -5814,7 +5815,8 @@ for a characteristic read operation by sending the following message:
     "serviceUuid": "0000180d-0000-1000-8000-00805f9b34fb",
     "characteristicUuid": "00002a21-0000-1000-8000-00805f9b34fb",
     "type": "read",
-    "code": 0
+    "code": 0,
+    "data": [1, 2]
   }
 }
 </pre>
@@ -5895,7 +5897,8 @@ bluetooth.SimulateDescriptorResponseParameters = {
    characteristicUuid: bluetooth.BluetoothUuid,
    descriptorUuid: bluetooth.BluetoothUuid,
    type: "read" / "write",
-   code: uint
+   code: uint,
+   ? data: [ * uint ]
 }
 </pre>
 
@@ -5907,7 +5910,7 @@ Issue: TODO: Finish the algorithm of bluetooth.simulateDescriptorResponse.
 
 <div class="example">
 A [=local end=] could simulate a response of success (error code `0x00` according to <a>Error Response</a>)
-for a descriptor read operation by sending the following message:
+with data for a descriptor read operation by sending the following message:
 
 <pre highlight="json">
 {
@@ -5919,7 +5922,8 @@ for a descriptor read operation by sending the following message:
     "characteristicUuid": "00002a21-0000-1000-8000-00805f9b34fb",
     "descriptorUuid": "00002901-0000-1000-8000-00805f9b34fb",
     "type": "read",
-    "code": 0
+    "code": 0,
+    "data": [1, 2]
   }
 }
 </pre>