diff --git a/goldens/public-api/router/index.api.md b/goldens/public-api/router/index.api.md
index 35bcb692691b..41993801e01d 100644
--- a/goldens/public-api/router/index.api.md
+++ b/goldens/public-api/router/index.api.md
@@ -84,7 +84,6 @@ export class ActivationEnd {
     snapshot: ActivatedRouteSnapshot);
     // (undocumented)
     snapshot: ActivatedRouteSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ActivationEnd;
@@ -96,7 +95,6 @@ export class ActivationStart {
     snapshot: ActivatedRouteSnapshot);
     // (undocumented)
     snapshot: ActivatedRouteSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ActivationStart;
@@ -163,7 +161,6 @@ export class ChildActivationEnd {
     snapshot: ActivatedRouteSnapshot);
     // (undocumented)
     snapshot: ActivatedRouteSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ChildActivationEnd;
@@ -175,7 +172,6 @@ export class ChildActivationStart {
     snapshot: ActivatedRouteSnapshot);
     // (undocumented)
     snapshot: ActivatedRouteSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ChildActivationStart;
@@ -329,7 +325,6 @@ export class GuardsCheckEnd extends RouterEvent {
     shouldActivate: boolean;
     // (undocumented)
     state: RouterStateSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.GuardsCheckEnd;
@@ -346,7 +341,6 @@ export class GuardsCheckStart extends RouterEvent {
     state: RouterStateSnapshot);
     // (undocumented)
     state: RouterStateSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.GuardsCheckStart;
@@ -438,7 +432,6 @@ export class NavigationCancel extends RouterEvent {
     code?: NavigationCancellationCode | undefined);
     readonly code?: NavigationCancellationCode | undefined;
     reason: string;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.NavigationCancel;
@@ -459,7 +452,6 @@ export class NavigationEnd extends RouterEvent {
     id: number,
     url: string,
     urlAfterRedirects: string);
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.NavigationEnd;
@@ -477,7 +469,6 @@ export class NavigationError extends RouterEvent {
     // (undocumented)
     error: any;
     readonly target?: RouterStateSnapshot | undefined;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.NavigationError;
@@ -524,7 +515,6 @@ export class NavigationStart extends RouterEvent {
         [k: string]: any;
         navigationId: number;
     } | null;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.NavigationStart;
@@ -637,7 +627,6 @@ export class ResolveEnd extends RouterEvent {
     state: RouterStateSnapshot);
     // (undocumented)
     state: RouterStateSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ResolveEnd;
@@ -657,7 +646,6 @@ export class ResolveStart extends RouterEvent {
     state: RouterStateSnapshot);
     // (undocumented)
     state: RouterStateSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.ResolveStart;
@@ -695,7 +683,6 @@ export class RouteConfigLoadEnd {
     route: Route);
     // (undocumented)
     route: Route;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.RouteConfigLoadEnd;
@@ -707,7 +694,6 @@ export class RouteConfigLoadStart {
     route: Route);
     // (undocumented)
     route: Route;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.RouteConfigLoadStart;
@@ -999,7 +985,6 @@ export class RoutesRecognized extends RouterEvent {
     state: RouterStateSnapshot);
     // (undocumented)
     state: RouterStateSnapshot;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.RoutesRecognized;
@@ -1025,7 +1010,6 @@ export class Scroll {
     readonly routerEvent: NavigationEnd | NavigationSkipped;
     // (undocumented)
     readonly scrollBehavior?: "manual" | "after-transition" | undefined;
-    // (undocumented)
     toString(): string;
     // (undocumented)
     readonly type = EventType.Scroll;
@@ -1087,7 +1071,6 @@ export class UrlSegment {
         [name: string]: string;
     };
     path: string;
-    // (undocumented)
     toString(): string;
 }
 
@@ -1105,7 +1088,6 @@ export class UrlSegmentGroup {
     get numberOfChildren(): number;
     parent: UrlSegmentGroup | null;
     segments: UrlSegment[];
-    // (undocumented)
     toString(): string;
 }
 
@@ -1130,7 +1112,6 @@ export class UrlTree {
     get queryParamMap(): ParamMap;
     queryParams: Params;
     root: UrlSegmentGroup;
-    // (undocumented)
     toString(): string;
 }
 
diff --git a/packages/router/src/events.ts b/packages/router/src/events.ts
index 8a3e6f8144ca..12e9c3988698 100644
--- a/packages/router/src/events.ts
+++ b/packages/router/src/events.ts
@@ -7,9 +7,9 @@
  */
 
 import {NavigationBehaviorOptions, Route} from './models';
+import type {Navigation} from './navigation_transition';
 import {ActivatedRouteSnapshot, RouterStateSnapshot} from './router_state';
 import {UrlTree} from './url_tree';
-import type {Navigation} from './navigation_transition';
 
 /**
  * Identifies the call or event that triggered a navigation.
@@ -135,7 +135,7 @@ export class NavigationStart extends RouterEvent {
     this.restoredState = restoredState;
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   override toString(): string {
     return `NavigationStart(id: ${this.id}, url: '${this.url}')`;
   }
@@ -164,7 +164,7 @@ export class NavigationEnd extends RouterEvent {
     super(id, url);
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   override toString(): string {
     return `NavigationEnd(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}')`;
   }
@@ -255,7 +255,7 @@ export class NavigationCancel extends RouterEvent {
     super(id, url);
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   override toString(): string {
     return `NavigationCancel(id: ${this.id}, url: '${this.url}')`;
   }
@@ -331,7 +331,7 @@ export class NavigationError extends RouterEvent {
     super(id, url);
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   override toString(): string {
     return `NavigationError(id: ${this.id}, url: '${this.url}', error: ${this.error})`;
   }
@@ -358,7 +358,7 @@ export class RoutesRecognized extends RouterEvent {
     super(id, url);
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   override toString(): string {
     return `RoutesRecognized(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}', state: ${this.state})`;
   }
@@ -387,6 +387,7 @@ export class GuardsCheckStart extends RouterEvent {
     super(id, url);
   }
 
+  /** @docs-private */
   override toString(): string {
     return `GuardsCheckStart(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}', state: ${this.state})`;
   }
@@ -417,6 +418,7 @@ export class GuardsCheckEnd extends RouterEvent {
     super(id, url);
   }
 
+  /** @docs-private */
   override toString(): string {
     return `GuardsCheckEnd(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}', state: ${this.state}, shouldActivate: ${this.shouldActivate})`;
   }
@@ -448,6 +450,7 @@ export class ResolveStart extends RouterEvent {
     super(id, url);
   }
 
+  /** @docs-private */
   override toString(): string {
     return `ResolveStart(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}', state: ${this.state})`;
   }
@@ -475,6 +478,7 @@ export class ResolveEnd extends RouterEvent {
     super(id, url);
   }
 
+  /** @docs-private */
   override toString(): string {
     return `ResolveEnd(id: ${this.id}, url: '${this.url}', urlAfterRedirects: '${this.urlAfterRedirects}', state: ${this.state})`;
   }
@@ -494,6 +498,8 @@ export class RouteConfigLoadStart {
     /** @docsNotRequired */
     public route: Route,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     return `RouteConfigLoadStart(path: ${this.route.path})`;
   }
@@ -513,6 +519,8 @@ export class RouteConfigLoadEnd {
     /** @docsNotRequired */
     public route: Route,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     return `RouteConfigLoadEnd(path: ${this.route.path})`;
   }
@@ -533,6 +541,8 @@ export class ChildActivationStart {
     /** @docsNotRequired */
     public snapshot: ActivatedRouteSnapshot,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     const path = (this.snapshot.routeConfig && this.snapshot.routeConfig.path) || '';
     return `ChildActivationStart(path: '${path}')`;
@@ -553,6 +563,8 @@ export class ChildActivationEnd {
     /** @docsNotRequired */
     public snapshot: ActivatedRouteSnapshot,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     const path = (this.snapshot.routeConfig && this.snapshot.routeConfig.path) || '';
     return `ChildActivationEnd(path: '${path}')`;
@@ -574,6 +586,8 @@ export class ActivationStart {
     /** @docsNotRequired */
     public snapshot: ActivatedRouteSnapshot,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     const path = (this.snapshot.routeConfig && this.snapshot.routeConfig.path) || '';
     return `ActivationStart(path: '${path}')`;
@@ -595,6 +609,8 @@ export class ActivationEnd {
     /** @docsNotRequired */
     public snapshot: ActivatedRouteSnapshot,
   ) {}
+
+  /** @docs-private */
   toString(): string {
     const path = (this.snapshot.routeConfig && this.snapshot.routeConfig.path) || '';
     return `ActivationEnd(path: '${path}')`;
@@ -623,6 +639,7 @@ export class Scroll {
     readonly scrollBehavior?: 'manual' | 'after-transition',
   ) {}
 
+  /** @docs-private */
   toString(): string {
     const pos = this.position ? `${this.position[0]}, ${this.position[1]}` : null;
     return `Scroll(anchor: '${this.anchor}', position: '${pos}')`;
diff --git a/packages/router/src/url_tree.ts b/packages/router/src/url_tree.ts
index bb794f20ce5c..3406e8030c28 100644
--- a/packages/router/src/url_tree.ts
+++ b/packages/router/src/url_tree.ts
@@ -9,9 +9,9 @@
 import {computed, Injectable, ɵRuntimeError as RuntimeError, Signal} from '@angular/core';
 
 import {RuntimeErrorCode} from './errors';
+import type {Router} from './router';
 import {convertToParamMap, ParamMap, Params, PRIMARY_OUTLET} from './shared';
 import {equalArraysOrString, shallowEqual} from './utils/collection';
-import type {Router} from './router';
 
 /**
  * A set of options which specify how to determine if a `UrlTree` is active, given the `UrlTree`
@@ -285,7 +285,7 @@ export class UrlTree {
     return this._queryParamMap;
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   toString(): string {
     return DEFAULT_SERIALIZER.serialize(this);
   }
@@ -323,7 +323,7 @@ export class UrlSegmentGroup {
     return Object.keys(this.children).length;
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   toString(): string {
     return serializePaths(this);
   }
@@ -372,7 +372,7 @@ export class UrlSegment {
     return this._parameterMap;
   }
 
-  /** @docsNotRequired */
+  /** @docs-private */
   toString(): string {
     return serializePath(this);
   }