diff --git a/packages/router/src/router.ts b/packages/router/src/router.ts
index 8fbd39045b..ef4abe1bf8 100644
--- a/packages/router/src/router.ts
+++ b/packages/router/src/router.ts
@@ -110,7 +110,7 @@ export interface NavigationExtras {
   * this.router.navigate(['/view'], { preserveQueryParams: true });
   * ```
   *
-  * @deprecated
+  * @deprecated since v4
   */
   preserveQueryParams?: boolean;
 
diff --git a/packages/router/src/router_module.ts b/packages/router/src/router_module.ts
index 049673e430..4451ac013f 100644
--- a/packages/router/src/router_module.ts
+++ b/packages/router/src/router_module.ts
@@ -21,13 +21,12 @@ import {ErrorHandler, Router} from './router';
 import {ROUTES} from './router_config_loader';
 import {RouterOutletMap} from './router_outlet_map';
 import {NoPreloading, PreloadAllModules, PreloadingStrategy, RouterPreloader} from './router_preloader';
-import {ActivatedRoute, RouterStateSnapshot} from './router_state';
+import {ActivatedRoute} from './router_state';
 import {UrlHandlingStrategy} from './url_handling_strategy';
 import {DefaultUrlSerializer, UrlSerializer} from './url_tree';
 import {flatten} from './utils/collection';
 
 
-
 /**
  * @whatItDoes Contains a list of directives
  * @stable
@@ -224,8 +223,8 @@ export function provideRoutes(routes: Routes): any {
  * * 'legacy_disabled'- the initial navigation is not performed. The location listener is set up
  * after @deprecated
  * the root component gets created.
- * * `true` - same as 'legacy_enabled'. @deprecated
- * * `false` - same as 'legacy_disabled'. @deprecated
+ * * `true` - same as 'legacy_enabled'. @deprecated since v4
+ * * `false` - same as 'legacy_disabled'. @deprecated since v4
  *
  * The 'enabled' option should be used for applications unless there is a reason to have
  * more control over when the router starts its initial navigation due to some complex