diff --git a/management/advertiser.yaml b/management/advertiser.yaml
index e5018fb..946cf4b 100644
--- a/management/advertiser.yaml
+++ b/management/advertiser.yaml
@@ -95,6 +95,9 @@ paths:
                 IsDeleted:
                   type: boolean
                   default: false
+                CustomFieldsJson:
+                  type: string
+                  nullable: true
       responses:
         200:
           description: Advertiser Created
@@ -190,6 +193,9 @@ paths:
                   nullable: true
                 Id:
                   type: integer
+                CustomFieldsJson:
+                  type: string
+                  nullable: true
       responses:
         200:
           description: Updated Advertiser
diff --git a/management/schemas/advertiser.yaml b/management/schemas/advertiser.yaml
index 2a9fab0..643ee1f 100644
--- a/management/schemas/advertiser.yaml
+++ b/management/schemas/advertiser.yaml
@@ -64,6 +64,9 @@ schemas:
         type: integer
         format: int32
         nullable: true
+      CustomFieldsJson:
+        type: string
+        nullable: true
 
   AdvertiserList:
     type: object