diff --git a/packages/core/testing/src/component_fixture.ts b/packages/core/testing/src/component_fixture.ts
index a9f7ee6ee35..8793bcfce4f 100644
--- a/packages/core/testing/src/component_fixture.ts
+++ b/packages/core/testing/src/component_fixture.ts
@@ -111,6 +111,8 @@ export abstract class ComponentFixture<T> {
    * Set whether the fixture should autodetect changes.
    *
    * Also runs detectChanges once so that any existing change is detected.
+   *
+   * @param autoDetect Whether to autodetect changes. By default, `true`.
    */
   abstract autoDetectChanges(autoDetect?: boolean): void;