diff --git a/android/hal-ipc-api.txt b/android/hal-ipc-api.txt
index a1852a6..0b1fb7d 100644
--- a/android/hal-ipc-api.txt
+++ b/android/hal-ipc-api.txt
@@ -1926,6 +1926,12 @@ Android HAL name: "gatt" (BT_PROFILE_GATT_ID)
 		Valid GATT Read Parameters: As described in Read Characteristic
 
 	Opcode 0x8f - Write Descriptor notification
+
+		Notification parameters: Connection ID (4 octets)
+		                         Status (4 octets)
+		                         GATT Write Parameters (53 octets)
+		Valid GATT Write Parameters: As described in Write Characteristic
+
 	Opcode 0x90 - Execute Write notification
 	Opcode 0x91 - Read Remote RSSI notification
 	Opcode 0x92 - Listen notification
diff --git a/android/hal-msg.h b/android/hal-msg.h
index ee18172..9ba190c 100644
--- a/android/hal-msg.h
+++ b/android/hal-msg.h
@@ -1359,3 +1359,10 @@ struct hal_ev_gatt_client_read_descriptor {
 	int32_t status;
 	struct hal_gatt_read_params data;
 } __attribute__((packed));
+
+#define HAL_EV_GATT_CLIENT_WRITE_DESCRIPTOR	0x8f
+struct hal_ev_gatt_client_write_descriptor {
+	int32_t conn_id;
+	int32_t status;
+	struct hal_gatt_write_params data;
+} __attribute__((packed));