diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f9269533..1b8bfc507 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ### vNEXT
 
+- Define types of options and results (of `watchQuery`, `query`, `mutate`) ([PR #145](https://github.com/apollostack/angular2-apollo/pull/145))
+
 ### v0.7.0
 
 - Added support for **Ahead of Time** compilation ([PR #124](https://github.com/apollostack/angular2-apollo/pull/124))
diff --git a/src/Angular2Apollo.ts b/src/Angular2Apollo.ts
index 09b1575b4..b96476840 100644
--- a/src/Angular2Apollo.ts
+++ b/src/Angular2Apollo.ts
@@ -1,12 +1,23 @@
 import { OpaqueToken, Injectable, Inject } from '@angular/core';
 import { rxify } from 'apollo-client-rxjs';
-import { ApolloClient, ApolloQueryResult } from 'apollo-client';
+import { ApolloClient, ApolloQueryResult, WatchQueryOptions, MutationBehavior, MutationQueryReducersMap } from 'apollo-client';
 import { Observable } from 'rxjs/Observable';
+import { FragmentDefinition } from 'graphql';
 
 import { ApolloQueryObservable } from './ApolloQueryObservable';
 
 import 'rxjs/add/observable/from';
 
+export interface MutateOptions {
+  mutation: Document;
+  variables?: Object;
+  resultBehaviors?: MutationBehavior[];
+  fragments?: FragmentDefinition[];
+  optimisticResponse?: Object;
+  updateQueries?: MutationQueryReducersMap;
+  refetchQueries?: string[];
+}
+
 export const angularApolloClient = new OpaqueToken('AngularApolloClient');
 export function defaultApolloClient(client: ApolloClient): any {
   return {
@@ -21,15 +32,15 @@ export class Angular2Apollo {
     @Inject(angularApolloClient) private client: any
   ) {}
 
-  public watchQuery(options: any): ApolloQueryObservable<ApolloQueryResult> {
+  public watchQuery(options: WatchQueryOptions): ApolloQueryObservable<ApolloQueryResult> {
     return new ApolloQueryObservable(rxify(this.client.watchQuery)(options));
   }
 
-  public query(options: any) {
+  public query(options: WatchQueryOptions): Promise<ApolloQueryResult> {
     return this.client.query(options);
   }
 
-  public mutate(options: any) {
+  public mutate(options: MutateOptions): Promise<ApolloQueryResult> {
     return this.client.mutate(options);
   }