diff --git a/packages/core/src/change_detection/constants.ts b/packages/core/src/change_detection/constants.ts
index 9d6eed4759..ed54b1933d 100644
--- a/packages/core/src/change_detection/constants.ts
+++ b/packages/core/src/change_detection/constants.ts
@@ -18,6 +18,7 @@ export enum ChangeDetectionStrategy {
    * Use the `CheckOnce` strategy, meaning that automatic change detection is deactivated
    * until reactivated by setting the strategy to `Default` (`CheckAlways`).
    * Change detection can still be explicitly invoked.
+   * This strategy applies to all child directives and cannot be overridden.
    */
   OnPush = 0,