         :param: request An unauthenticated NSURLRequest.
 
         :returns: A signal that sends the authenticated request on success or
-            an error when the request could not be authenticated.
+            an error if the request could not be authenticated.
     */
     @objc
     public func RH_authenticateRequest(request: NSURLRequest) -> RACSignal {

    
        :param: request An unauthenticated NSURLRequest.
    
        :returns: A `SignalProducer` that, when started, creates and sends a
            signal that sends the authenticated request on success or an error
            when the request could not be authenticated.
    */
    public func authenticateRequest(request: NSURLRequest) -> SignalProducer<NSURLRequest, NSError> {
        return SignalProducer { observer, disposable in

        :param: username The resource owner's username.
        :param: password The resource owner's password.

        :returns: A `SignalProducer` that, when started, creates a signal that
            completes when the request finishes successfully or sends an error
            if the request finishes with an error.
    */
    public func requestAccessToken(#username: String, password: String) -> SignalProducer<Void, NSError> {
        return SignalProducer { observer, disposable in
