diff --git a/knockout.validation/knockout.validation.d.ts b/knockout.validation/knockout.validation.d.ts
index 88c1cc59d..72ea55dc9 100644
--- a/knockout.validation/knockout.validation.d.ts
+++ b/knockout.validation/knockout.validation.d.ts
@@ -5,66 +5,66 @@
 
 /// <reference path="../knockout/knockout.d.ts" />
 
-interface KnockoutValidationGroupingOptions {
-    deep?: bool;
-    observable?: bool;
+interface KnockoutValidationGroupingOptions {
+    deep?: boolean;
+    observable?: boolean;
 }
 
-interface KnockoutValidationConfiguration {
-    registerExtenders?: bool;
-    messagesOnModified?: bool;
+interface KnockoutValidationConfiguration {
+    registerExtenders?: boolean;
+    messagesOnModified?: boolean;
     messageTemplate?: string;
-    insertMessages?: bool;
-    parseInputAttributes?: bool;
-    writeInputAttributes?: bool;
-    decorateElement?: bool;
+    insertMessages?: boolean;
+    parseInputAttributes?: boolean;
+    writeInputAttributes?: boolean;
+    decorateElement?: boolean;
     errorClass?: string;
     errorElementClass?: string;
     errorMessageClass?: string;
-    grouping?: KnockoutValidationGroupingOptions;
+    grouping?: KnockoutValidationGroupingOptions;
 }
 
-interface KnockoutValidationUtils {
-    isArray(o: any): bool;
-    isObject(o: any): bool;
+interface KnockoutValidationUtils {
+    isArray(o: any): boolean;
+    isObject(o: any): boolean;
     values(o: any): any[];
     getValue(o: any): any;
-    hasAttribute(node: Element, attr: string): bool;
-    isValidatable(o: any): bool;
+    hasAttribute(node: Element, attr: string): boolean;
+    isValidatable(o: any): boolean;
     insertAfter(node: Element, newNode: Element): void;
     newId(): number;
     getConfigOptions(element: Element): KnockoutValidationConfiguration;
     setDomData(node: Element, data: KnockoutValidationConfiguration): void;
     getDomData(node: Element): KnockoutValidationConfiguration;
     contextFor(node: Element): KnockoutValidationConfiguration;
-    isEmptyVal(val: any): bool;
+    isEmptyVal(val: any): boolean;
 }
 
-interface KnockoutValidationAsyncCallbackArgs {
-    isValid: bool;
+interface KnockoutValidationAsyncCallbackArgs {
+    isValid: boolean;
+    message: string;
+}
+
+interface KnockoutValidationAsyncCallback {
+    (result: boolean): void;
+    (result: KnockoutValidationAsyncCallbackArgs): void;
+}
+
+interface KnockoutValidationRuleDefinition {
     message: string;
+    validator(value: any, params: any): boolean;
 }
 
-interface KnockoutValidationAsyncCallback {
-    (result: bool): void;
-    (result: KnockoutValidationAsyncCallbackArgs): void;
+interface KnockoutValidationAsyncRuleDefinition extends KnockoutValidationRuleDefinition {
+    async: boolean;
+    validator(value: any, params: any, callback: KnockoutValidationAsyncCallback): void;
 }
 
-interface KnockoutValidationRuleDefinition {
-    message: string;
-    validator(value: any, params: any): bool;
+interface KnockoutValidationAnonymousRuleDefinition {
+    validation: KnockoutValidationRuleDefinition;
 }
 
-interface KnockoutValidationAsyncRuleDefinition extends KnockoutValidationRuleDefinition {
-    async: bool;
-    validator(value: any, params: any, callback: KnockoutValidationAsyncCallback): void;
-}
-
-interface KnockoutValidationAnonymousRuleDefinition {
-    validation: KnockoutValidationRuleDefinition;
-}
-
-interface KnockoutValidationRuleDefinitions {
+interface KnockoutValidationRuleDefinitions {
     date: KnockoutValidationRuleDefinition;
     dateISO: KnockoutValidationRuleDefinition;
     digit: KnockoutValidationRuleDefinition;
@@ -80,30 +80,30 @@ interface KnockoutValidationRuleDefinitions {
     phoneUS: KnockoutValidationRuleDefinition;
     required: KnockoutValidationRuleDefinition;
     step: KnockoutValidationRuleDefinition;
-    unique: KnockoutValidationRuleDefinition;
+    unique: KnockoutValidationRuleDefinition;
 }
 
-interface KnockoutValidationRule {
+interface KnockoutValidationRule {
     rule: string;
     params: any;
     message?: string;
-    condition?: () => bool;
+    condition?: () => boolean;
 }
 
-interface KnockoutValidationErrors {
+interface KnockoutValidationErrors {
     (): string[];
     showAllMessages(): void;
-    showAllMessages(show: bool): void;
+    showAllMessages(show: boolean): void;
 }
 
-interface KnockoutValidationGroup {
+interface KnockoutValidationGroup {
     errors?: KnockoutValidationErrors;
-    isValid?: () => bool;
-    isAnyMessageShown?: () => bool;
+    isValid?: () => boolean;
+    isAnyMessageShown?: () => boolean;
 }
 
-interface KnockoutValidationStatic {
-    init(options?: KnockoutValidationConfiguration, force?: bool): void;
+interface KnockoutValidationStatic {
+    init(options?: KnockoutValidationConfiguration, force?: boolean): void;
     configure(options: KnockoutValidationConfiguration): void;
     reset(): void;
 
@@ -111,11 +111,8 @@ interface KnockoutValidationStatic {
 
     formatMessage(message: string, params: string): string;
 
-    addRule(observable: KnockoutObservableAny, rule: KnockoutValidationRule): KnockoutObservableAny;
-    addRule(observable: KnockoutObservableString, rule: KnockoutValidationRule): KnockoutObservableString;
-    addRule(observable: KnockoutObservableNumber, rule: KnockoutValidationRule): KnockoutObservableNumber;
-    addRule(observable: KnockoutObservableBool, rule: KnockoutValidationRule): KnockoutObservableBool;
-    addRule(observable: KnockoutObservableDate, rule: KnockoutValidationRule): KnockoutObservableDate;
+    addRule<T>(observable: KnockoutObservable<T>, rule: KnockoutValidationRule): KnockoutObservable<T>;
+
     addAnonymousRule(observable: KnockoutObservableBase, ruleObj: KnockoutValidationAnonymousRuleDefinition): void;
 
     insertValidationMessage(element: Element): Element;
@@ -128,18 +125,18 @@ interface KnockoutValidationStatic {
     utils: KnockoutValidationUtils;
 
     localize(msgTranslations: any): void;
-    validateObservable(observable: KnockoutObservableBase): bool;
+    validateObservable(observable: KnockoutObservableBase): boolean;
 }
 
-interface KnockoutStatic {
+interface KnockoutStatic {
     validation: KnockoutValidationStatic;
     validatedObservable(initialValue: any): KnockoutObservableBase;
-    applyBindingsWithValidation(viewModel: any, rootNode?: any, options?: KnockoutValidationConfiguration): void;
+    applyBindingsWithValidation(viewModel: any, rootNode?: any, options?: KnockoutValidationConfiguration): void;
 }
 
-interface KnockoutSubscribableFunctions {
+interface KnockoutSubscribableFunctions {
     isValid: KnockoutComputed;
-    isValidating: KnockoutObservableBool;
-    rules: KnockoutObservableArray;
+    isValidating: KnockoutObservable<boolean>;
+    rules: KnockoutObservableArray;
 }