Update README.md (#17692)

windows_service/README.md

@@ -81,6 +81,8 @@ The check automatically tags the Windows service name to each service check in t
 
 Beginning with Agent version 7.40, the check can add a `windows_service_startup_type:<STARTUP_TYPE>` tag to each service check to indicate the startup type of the service. Set the `windows_service_startup_type_tag` option to include this tag with each service check.
 
+Beginning with Agent version 7.55, the check can add a `display_name:<DISPLAY_NAME>` tag to each service check to indicate the display name of the service. Set the `collect_display_name_as_tag` option to `true` to include this tag with each service check.
+
 ### Validation
 
 [Run the Agent's status subcommand][5] and look for `windows_service` under the **Checks** section.