diff --git a/site/specs/messaging.yml b/site/specs/messaging.yml
index 81b733399..28e2569df 100644
--- a/site/specs/messaging.yml
+++ b/site/specs/messaging.yml
@@ -883,6 +883,7 @@ paths:
         - $ref: '#/components/parameters/errorCode'
         - $ref: '#/components/parameters/fromDateTime'
         - $ref: '#/components/parameters/toDateTime'
+        - $ref: '#/components/parameters/campaignId'
         - $ref: '#/components/parameters/sort'
         - $ref: '#/components/parameters/pageToken'
         - $ref: '#/components/parameters/limit'
@@ -1492,6 +1493,14 @@ components:
       example: 2022-09-14T18:20:16.000Z
       schema:
         type: string
+    campaignId:
+      in: query
+      name: campaignId
+      required: false
+      description: The campaign ID of the message.
+      example: CJEUMDK
+      schema:
+        type: string
     sort:
       in: query
       name: sort
@@ -1661,6 +1670,11 @@ components:
           description: The campaign class of the message if it has one.
           nullable: true
           example: T
+        campaignId:
+          type: string
+          description: The campaign ID of the message if it has one.
+          nullable: true
+          example: CJEUMDK
     pageInfo:
       title: PageInfo
       type: object