diff --git a/src/datamodel_description.json b/src/datamodel_description.json
new file mode 100644
index 0000000000000000000000000000000000000000..c08743809065f19a38dec583f14867b500301197
--- /dev/null
+++ b/src/datamodel_description.json
@@ -0,0 +1,49 @@
+{
+	"Device.": {
+		"type": "object",
+		"protocols": [
+			"cwmp",
+			"usp"
+		],
+		"description": "The top-level object for a Device.",
+		"access": false,
+		"array": false,
+		"Device.QoS.": {
+			"type": "object",
+			"protocols": [
+				"cwmp",
+				"usp"
+			],
+			"description": "Queue management configuration object.",
+			"access": false,
+			"array": false,
+			"Device.QoS.Classification.{i}.": {
+				"type": "object",
+				"protocols": [
+					"cwmp",
+					"usp"
+				],
+				"description": "Classification table. For enabled table entries, if <<param|Interface>> is not a valid reference and <<param|AllInterfaces>> is <<false>>, then the table entry is inoperable and the CPE MUST set <<param|Status>> to <<enum|Error_Misconfigured|Status>>. Several of this objects parameters specify DHCP option values. Some cases are version neutral (the parameter can apply to both DHCPv4 and DHCPv6), but in other cases the representation of the option is different for DHCPv4 and DHCPv6, so it is necessary to define separate DHCPv4-specific and DHCPv6-specific parameters. Therefore, an instance of this object that uses DHCP option values as classification criteria will be associated with either DHCPv4 or DHCPv6, as indicated by the <<param|DHCPType>> parameter.",
+				"access": true,
+				"array": true,
+				"{BBF_VENDOR_PREFIX}VLANIDMark": {
+					"type": "int",
+					"read": true,
+					"write": true,
+					"protocols": [
+						"cwmp",
+						"usp"
+					],
+					"description": "Specifies the VLAN ID to mark on egress packets that match this classification rule. A value of -1 indicates no VLAN ID marking will be applied.",
+					"default": "-1",
+					"datatype": "int",
+					"range": [
+						{
+							"min": -1
+						}
+					]
+				}
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/qos_bbf.c b/src/qos_bbf.c
index 6e40051a3aeeb180dc0897028c4b49fe7a8e490f..80231f42b80c908ba9457c82ab8f29121ca1c9b2 100644
--- a/src/qos_bbf.c
+++ b/src/qos_bbf.c
@@ -2158,7 +2158,7 @@ DMLEAF tQoSClassificationParams[] = {
 {"TrafficClass", &DMWRITE, DMT_INT, get_QoSClassification_TrafficClass, set_QoSClassification_TrafficClass, BBFDM_BOTH},
 {"Policer", &DMWRITE, DMT_STRING, get_QoSClassification_Policer, set_QoSClassification_Policer, BBFDM_BOTH},
 //{"App", &DMWRITE, DMT_STRING, get_QoSClassification_App, set_QoSClassification_App, BBFDM_BOTH},
-{BBF_VENDOR_PREFIX"VLANIDMark", &DMWRITE, DMT_UNINT, get_QoSClassification_VLANIDMark, set_QoSClassification_VLANIDMark, BBFDM_BOTH},
+{BBF_VENDOR_PREFIX"VLANIDMark", &DMWRITE, DMT_INT, get_QoSClassification_VLANIDMark, set_QoSClassification_VLANIDMark, BBFDM_BOTH},
 {0}
 };