diff --git a/Documentation/API.md b/Documentation/API.md
index e5e2e1f2..87cfc549 100644
--- a/Documentation/API.md
+++ b/Documentation/API.md
@@ -137,13 +137,13 @@ extension NSObject {
 ```swift
 extension NSURLSession {
 
-    public func rx_response(request: NSURLRequest) -> Observable<(NSData!, NSURLResponse!)> {}
+    public func rx_response(request: NSURLRequest) -> Observable<(NSData, NSURLResponse)> {}
 
     public func rx_data(request: NSURLRequest) -> Observable<NSData> {}
 
-    public func rx_JSON(request: NSURLRequest) -> Observable<AnyObject!> {}
+    public func rx_JSON(request: NSURLRequest) -> Observable<AnyObject> {}
 
-    public func rx_JSON(URL: NSURL) -> Observable<AnyObject!> {}
+    public func rx_JSON(URL: NSURL) -> Observable<AnyObject> {}
 
 }
 ```
diff --git a/RxCocoa/Common/Observables/NSURLSession+Rx.swift b/RxCocoa/Common/Observables/NSURLSession+Rx.swift
index 72bccab2..4b462e7b 100644
--- a/RxCocoa/Common/Observables/NSURLSession+Rx.swift
+++ b/RxCocoa/Common/Observables/NSURLSession+Rx.swift
@@ -74,7 +74,7 @@ func convertURLRequestToCurlCommand(request: NSURLRequest) -> String {
         returnValue += "-H \"\(escapedKey): \(escapedValue)\" "
     }
 
-    let URLString = request.URL?.absoluteString ?? "<unkown url>"
+    let URLString = request.URL?.absoluteString ?? "<unknown url>"
 
     returnValue += "\"\(escapeTerminalString(URLString))\""
 
@@ -204,8 +204,8 @@ extension NSURLSession {
     - returns: Observable sequence of response JSON.
     */
     @warn_unused_result(message="http://git.io/rxs.uo")
-    public func rx_JSON(request: NSURLRequest) -> Observable<AnyObject!> {
-        return rx_data(request).map { (data) -> AnyObject! in
+    public func rx_JSON(request: NSURLRequest) -> Observable<AnyObject> {
+        return rx_data(request).map { (data) -> AnyObject in
             do {
                 return try NSJSONSerialization.JSONObjectWithData(data ?? NSData(), options: [])
             } catch let error {
@@ -232,7 +232,7 @@ extension NSURLSession {
     - returns: Observable sequence of response JSON.
     */
     @warn_unused_result(message="http://git.io/rxs.uo")
-    public func rx_JSON(URL: NSURL) -> Observable<AnyObject!> {
+    public func rx_JSON(URL: NSURL) -> Observable<AnyObject> {
         return rx_JSON(NSURLRequest(URL: URL))
     }
 }
diff --git a/RxExample/RxExample/Examples/WikipediaImageSearch/WikipediaAPI/WikipediaAPI.swift b/RxExample/RxExample/Examples/WikipediaImageSearch/WikipediaAPI/WikipediaAPI.swift
index 2d76f4c3..41eb72ac 100644
--- a/RxExample/RxExample/Examples/WikipediaImageSearch/WikipediaAPI/WikipediaAPI.swift
+++ b/RxExample/RxExample/Examples/WikipediaImageSearch/WikipediaAPI/WikipediaAPI.swift
@@ -37,7 +37,7 @@ class DefaultWikipediaAPI: WikipediaAPI {
 
     private init() {}
 
-    private func rx_JSON(URL: NSURL) -> Observable<AnyObject!> {
+    private func rx_JSON(URL: NSURL) -> Observable<AnyObject> {
         return $.URLSession
             .rx_JSON(URL)
             .trackActivity(loadingWikipediaData)