diff --git a/android/hal-ipc-api.txt b/android/hal-ipc-api.txt
index fd2adac..c98c2ba 100644
--- a/android/hal-ipc-api.txt
+++ b/android/hal-ipc-api.txt
@@ -1838,6 +1838,16 @@ Android HAL name: "gatt" (BT_PROFILE_GATT_ID)
 		               Instance ID (1 octet)
 
 	Opcode 0x87 - Get Characteristic notification
+
+		Notification parameters: Connection ID (4 octets)
+		                         Status (4 octets)
+		                         GATT Service ID (18 octets)
+		                         GATT Char. ID (17 octets)
+		                         Char Prop. (4 octets)
+		Valid GATT Service: As described in Search Result
+		Valid GATT Char. ID: UUID (16 octets)
+		                     Instance ID (1 octet)
+
 	Opcode 0x88 - Get Descriptor notification
 	Opcode 0x89 - Get Included Service notification
 	Opcode 0x8a - Register For Notification notification
diff --git a/android/hal-msg.h b/android/hal-msg.h
index 9377154..a194d91 100644
--- a/android/hal-msg.h
+++ b/android/hal-msg.h
@@ -1267,3 +1267,12 @@ struct hal_ev_gatt_client_search_result {
 	int32_t conn_id;
 	struct hal_gatt_srvc_id srvc_id;
 } __attribute__((packed));
+
+#define HAL_EV_GATT_CLIENT_GET_CHARACTERISTIC	0x87
+struct hal_ev_gatt_client_get_characteristic {
+	int32_t conn_id;
+	int32_t status;
+	struct hal_gatt_srvc_id srvc_id;
+	struct hal_gatt_gatt_id char_id;
+	int32_t char_prop;
+} __attribute__((packed));