diff --git a/packages/core/src/zone/ng_zone.ts b/packages/core/src/zone/ng_zone.ts
index 8688b1a022..b4eb39c1d2 100644
--- a/packages/core/src/zone/ng_zone.ts
+++ b/packages/core/src/zone/ng_zone.ts
@@ -31,7 +31,7 @@ import {EventEmitter} from '../event_emitter';
  * import {NgIf} from '@angular/common';
  *
  * @Component({
- *   selector: 'ng-zone-demo'.
+ *   selector: 'ng-zone-demo',
  *   template: `
  *     <h2>Demo: NgZone</h2>
  *
@@ -63,9 +63,10 @@ import {EventEmitter} from '../event_emitter';
  *     this.progress = 0;
  *     this._ngZone.runOutsideAngular(() => {
  *       this._increaseProgress(() => {
- *       // reenter the Angular zone and display done
- *       this._ngZone.run(() => {console.log('Outside Done!') });
- *     }}));
+ *         // reenter the Angular zone and display done
+ *         this._ngZone.run(() => { console.log('Outside Done!'); });
+ *       });
+ *     });
  *   }
  *
  *   _increaseProgress(doneCallback: () => void) {
@@ -73,7 +74,7 @@ import {EventEmitter} from '../event_emitter';
  *     console.log(`Current progress: ${this.progress}%`);
  *
  *     if (this.progress < 100) {
- *       window.setTimeout(() => this._increaseProgress(doneCallback)), 10)
+ *       window.setTimeout(() => this._increaseProgress(doneCallback), 10);
  *     } else {
  *       doneCallback();
  *     }