diff --git a/knockout.validation/knockout.validation.d.ts b/knockout.validation/knockout.validation.d.ts
index 3fb49abb9..c17a7d904 100644
--- a/knockout.validation/knockout.validation.d.ts
+++ b/knockout.validation/knockout.validation.d.ts
@@ -143,6 +143,9 @@ interface KnockoutSubscribableFunctions<T> {
     isValidating: KnockoutObservable<boolean>;
     rules: KnockoutObservableArray<KnockoutValidationRule>;
     isModified: KnockoutObservable<boolean>;
+    error: KnockoutComputed<string>;
+    setError(error: string): void;
+    clearError(): void;
 }
 
 declare module "knockout.validation" {