diff --git a/android/hal-ipc-api.txt b/android/hal-ipc-api.txt
index 362f50f..a5b6cd8 100644
--- a/android/hal-ipc-api.txt
+++ b/android/hal-ipc-api.txt
@@ -1868,6 +1868,15 @@ Android HAL name: "gatt" (BT_PROFILE_GATT_ID)
 		Valid GATT Service & Incl. Service ID: As described in Search Result
 
 	Opcode 0x8a - Register For Notification notification
+
+		Notification parameters: Connection ID (4 octets)
+		                         Registered (4 octets)
+		                         Status (4 octets)
+		                         GATT Service ID (18 octets)
+		                         GATT Char. ID (17 octets)
+		Valid GATT Service ID: As described in Get Characteristic
+		Valid GATT Char. ID: As described in Get Characteristic
+
 	Opcode 0x8b - Notify notification
 	Opcode 0x8c - Read Characteristic notification
 	Opcode 0x8d - Write Characteristic notification
diff --git a/android/hal-msg.h b/android/hal-msg.h
index 5c47985..3f57c77 100644
--- a/android/hal-msg.h
+++ b/android/hal-msg.h
@@ -1293,3 +1293,12 @@ struct hal_ev_gatt_client_get_inc_service {
 	struct hal_gatt_srvc_id srvc_id;
 	struct hal_gatt_srvc_id incl_srvc_id;
 } __attribute__((packed));
+
+#define HAL_EV_GATT_CLIENT_REGISTER_FOR_NOTIF	0x8a
+struct hal_ev_gatt_client_reg_for_notif {
+	int32_t conn_id;
+	int32_t registered;
+	int32_t status;
+	struct hal_gatt_srvc_id srvc_id;
+	struct hal_gatt_gatt_id char_id;
+} __attribute__((packed));