diff --git a/cloud/wfm-rest-api/README.md b/cloud/wfm-rest-api/README.md
index 0a627a6..1f242ea 100644
--- a/cloud/wfm-rest-api/README.md
+++ b/cloud/wfm-rest-api/README.md
@@ -30,14 +30,27 @@ See demo application integration or [example application](./example) for more de
 
 ### Custom database integrations
 
-Custom database integrations are possible thanks to `CrudRepository` interface.
-See Api documentation for more details.
+Custom database integrations are possible thanks to `PagingDataRepository` interface.
 
 ## Rest API
 
 Module provides a way to dynamically create API for different business objects.
 Created api will use simplified implementations for typical create, read, delete and update operations. It's not recomended to use `wfm-rest-api` outside the WFM framework. Please use database driver or ORM framework or your choice.
 
+## Rest API structure
+
+API produces and expects JSON objects.
+Structure of payload will vary depending on the interface passed as generic parameter to `PagingDataRepository`
+For example:
+
+```typescript
+interface MyData{
+  name:string
+  fieldNumber:1
+}
+const repository = new PagingDataRepository<MyData>();
+```
+
 ## Rest API definitions
 
 Definitions apply to every object exposed by this API. Placeholder `{object}` can be replaced by `workflow`, `workorder` and `result`.
@@ -76,28 +89,38 @@ Retrieve specific object by id
 
 Example `/workorders/B1r71fOBr`
 
+Return 204
+
 ### Save object
 
 > POST {object}/
 
+Paylod should contain at least `id` field that will be used as object id.
+
 ### Update object
 
 > PUT {object}/:objectId
 
+Where `:objectId` is an `id` field of the object.
+
 ### Delete object
 
 > DELETE {object}/:objectId
 
+Where `:objectId` is an `id` field of the object.
+
 ### Error handling
 
 In case of error express `next` callback is being called with `ApiError` instance.
 Users should build their own middleware for global error handling in their application.
 
-Api returns non 200 status in case of error.
+Api will returns non 200 status in case of error.
 
 `400` - For user input error (missing required field etc.)
 `500` - For internal server errors
 
+Api will return `204` status code if content is missing (for example invalid id was provided)
+
 For every error `ApiError` object is being returned.
 For example:
 
diff --git a/cloud/wfm-rest-api/src/data-api/PagingDataRepository.ts b/cloud/wfm-rest-api/src/data-api/PagingDataRepository.ts
index 3224556..6a55804 100644
--- a/cloud/wfm-rest-api/src/data-api/PagingDataRepository.ts
+++ b/cloud/wfm-rest-api/src/data-api/PagingDataRepository.ts
@@ -11,6 +11,7 @@ import { PageResponse } from '../data-api/PageResponse';
  * Interface is being used internally to perform database operations for WFM models
  * It's not recomended to use it for other application business logic.
  *
+ * T - interface with fields that are expected to be returned by this repository
  */
 export interface PagingDataRepository<T> {