diff --git a/OpenAPI/TS28312_IntentNrm.yaml b/OpenAPI/TS28312_IntentNrm.yaml
index 725adc0172f8682957ab284f4360ae4e6fe59dc0..7f98a65dca1136c21fb9b97575b3bf06315e930a 100644
--- a/OpenAPI/TS28312_IntentNrm.yaml
+++ b/OpenAPI/TS28312_IntentNrm.yaml
@@ -781,6 +781,12 @@ components:
           type: array
           items:
             $ref: '#/components/schemas/InFeasibleExpectationInfo'
+        additionalPreEvaluationInfo:
+          description: >-
+            It describes the additional provide additional pre-evaluation information for feasibility
+            check process. The content and format is vendor specific.
+          type: string
+          readOnly: true
       required:
         - feasibilityCheckResult
         - infeasibilityReasons
@@ -819,6 +825,12 @@ components:
             $ref: '#/components/schemas/ExpectationExplorationResult'
           uniqueItems: true
           minItems: 1
+        additionalPreEvaluationInfo:
+          description: >-
+            It describes the additional provide additional pre-evaluation information for intent exploration
+            process. The content and format is vendor specific.
+          type: string
+          readOnly: true 
         expectationExplorationStatus:
           description: ->
             It describes the status of intent exploration process.