diff --git a/x-pack/plugins/cases/docs/openapi/bundled.json b/x-pack/plugins/cases/docs/openapi/bundled.json
index 4d6905006c08d..e50a84556f37b 100644
--- a/x-pack/plugins/cases/docs/openapi/bundled.json
+++ b/x-pack/plugins/cases/docs/openapi/bundled.json
@@ -5568,6 +5568,7 @@
           "comment": {
             "description": "The new comment. It is required only when `type` is `user`.",
             "type": "string",
+            "maxLength": 30000,
             "example": "A new comment."
           },
           "owner": {
@@ -5657,6 +5658,7 @@
           "comment": {
             "description": "The new comment. It is required only when `type` is `user`.",
             "type": "string",
+            "maxLength": 30000,
             "example": "A new comment."
           },
           "id": {
diff --git a/x-pack/plugins/cases/docs/openapi/bundled.yaml b/x-pack/plugins/cases/docs/openapi/bundled.yaml
index 7608a44f3e45e..92227b16fe9ce 100644
--- a/x-pack/plugins/cases/docs/openapi/bundled.yaml
+++ b/x-pack/plugins/cases/docs/openapi/bundled.yaml
@@ -3606,6 +3606,7 @@ components:
         comment:
           description: The new comment. It is required only when `type` is `user`.
           type: string
+          maxLength: 30000
           example: A new comment.
         owner:
           $ref: '#/components/schemas/owners'
@@ -3672,6 +3673,7 @@ components:
         comment:
           description: The new comment. It is required only when `type` is `user`.
           type: string
+          maxLength: 30000
           example: A new comment.
         id:
           type: string
diff --git a/x-pack/plugins/cases/docs/openapi/components/schemas/add_user_comment_request_properties.yaml b/x-pack/plugins/cases/docs/openapi/components/schemas/add_user_comment_request_properties.yaml
index 40efb7f945f45..beac63c377ade 100644
--- a/x-pack/plugins/cases/docs/openapi/components/schemas/add_user_comment_request_properties.yaml
+++ b/x-pack/plugins/cases/docs/openapi/components/schemas/add_user_comment_request_properties.yaml
@@ -5,6 +5,7 @@ properties:
   comment:
     description: The new comment. It is required only when `type` is `user`.
     type: string
+    maxLength: 30000
     example: A new comment.
   owner:
     $ref: 'owners.yaml'
diff --git a/x-pack/plugins/cases/docs/openapi/components/schemas/update_user_comment_request_properties.yaml b/x-pack/plugins/cases/docs/openapi/components/schemas/update_user_comment_request_properties.yaml
index 22fb76d9bba74..a83050e93eaaf 100644
--- a/x-pack/plugins/cases/docs/openapi/components/schemas/update_user_comment_request_properties.yaml
+++ b/x-pack/plugins/cases/docs/openapi/components/schemas/update_user_comment_request_properties.yaml
@@ -5,6 +5,7 @@ properties:
   comment:
     description: The new comment. It is required only when `type` is `user`.
     type: string
+    maxLength: 30000
     example: A new comment.
   id:
     type: string