Includes info about Location header when updating state of all messages in mail folder

Author: MartinM85

api-reference/beta/api/mailfolder-updateallmessagesreadstate.md

@@ -57,7 +57,7 @@ The following table lists the parameters that are required when you call this ac
 
 ## Response
 
-If successful, this action returns a `202 Accepted` response code.
+If successful, this action returns a `202 Accepted` response code. The response contains a `Location` header that specifies the location of the [mailFolderOperation](./mailfolderoperation-get.md) that was created to handle the updating read state of the messages. Check the status of the updating operation by making a GET request to this location.
 
 ## Examples
 
@@ -122,4 +122,5 @@ The following example shows the response.
 -->
 ```http
 HTTP/1.1 202 Accepted
+Location: https://graph.microsoft.com/beta/users('95de90d3-2e59-4c87-9303-8cbc24ec3985')/mailFolders('AAMkAGRkZTFiMD')/operations('5667fd27-dc59-4e78-9ad2-857dbb437841')
 ```