diff --git a/OpenAPI/TS28104_MdaNrm.yaml b/OpenAPI/TS28104_MdaNrm.yaml
index 3a83c1ae4f6f9af4bd291ed88932b4d064052545..735cbbd7004bb88208e33a86699a4ce6cd14e681 100644
--- a/OpenAPI/TS28104_MdaNrm.yaml
+++ b/OpenAPI/TS28104_MdaNrm.yaml
@@ -145,6 +145,12 @@ components:
               format: float
               minimum: 0
 
+    MDADomain:
+      type: string
+      enum:
+        - CN
+        - RAN
+        - CROSS_DOMAIN
 
 #-------- Definition of types for name-containments ------
     SubNetwork-ncO-MdaNrm:
@@ -177,6 +183,8 @@ components:
                   properties:
                     supportedMDACapabilities:
                       $ref: '#/components/schemas/MDATypes'
+                    supportedMDADomain:
+                      $ref: '#/components/schemas/MDADomain'  
                     mLModelRefList:
                       $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnListRo'
                     aIMLInferenceFunctionRefList: