diff --git a/talk/app/webrtc/objc/RTCPeerConnection.mm b/talk/app/webrtc/objc/RTCPeerConnection.mm
index a7e31a1d77..9188653e8f 100644
--- a/talk/app/webrtc/objc/RTCPeerConnection.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnection.mm
@@ -37,7 +37,7 @@
 #import "RTCMediaConstraints+Internal.h"
 #import "RTCMediaStream+Internal.h"
 #import "RTCSessionDescription+Internal.h"
-#import "RTCSessionDescriptonDelegate.h"
+#import "RTCSessionDescriptionDelegate.h"
 #import "RTCSessionDescription.h"
 
 #include "talk/app/webrtc/jsep.h"
@@ -50,8 +50,9 @@ namespace webrtc {
 class RTCCreateSessionDescriptionObserver
     : public CreateSessionDescriptionObserver {
  public:
-  RTCCreateSessionDescriptionObserver(id<RTCSessionDescriptonDelegate> delegate,
-                                      RTCPeerConnection* peerConnection) {
+  RTCCreateSessionDescriptionObserver(
+      id<RTCSessionDescriptionDelegate> delegate,
+      RTCPeerConnection* peerConnection) {
     _delegate = delegate;
     _peerConnection = peerConnection;
   }
@@ -76,13 +77,13 @@ class RTCCreateSessionDescriptionObserver
   }
 
  private:
-  id<RTCSessionDescriptonDelegate> _delegate;
+  id<RTCSessionDescriptionDelegate> _delegate;
   RTCPeerConnection* _peerConnection;
 };
 
 class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
  public:
-  RTCSetSessionDescriptionObserver(id<RTCSessionDescriptonDelegate> delegate,
+  RTCSetSessionDescriptionObserver(id<RTCSessionDescriptionDelegate> delegate,
                                    RTCPeerConnection* peerConnection) {
     _delegate = delegate;
     _peerConnection = peerConnection;
@@ -104,7 +105,7 @@ class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
   }
 
  private:
-  id<RTCSessionDescriptonDelegate> _delegate;
+  id<RTCSessionDescriptionDelegate> _delegate;
   RTCPeerConnection* _peerConnection;
 };
 }
@@ -132,7 +133,7 @@ class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
   return YES;
 }
 
-- (void)createAnswerWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+- (void)createAnswerWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                      constraints:(RTCMediaConstraints*)constraints {
   talk_base::scoped_refptr<webrtc::RTCCreateSessionDescriptionObserver>
       observer(new talk_base::RefCountedObject<
@@ -140,7 +141,7 @@ class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
   self.peerConnection->CreateAnswer(observer, constraints.constraints);
 }
 
-- (void)createOfferWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+- (void)createOfferWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                     constraints:(RTCMediaConstraints*)constraints {
   talk_base::scoped_refptr<webrtc::RTCCreateSessionDescriptionObserver>
       observer(new talk_base::RefCountedObject<
@@ -154,7 +155,7 @@ class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
 }
 
 - (void)setLocalDescriptionWithDelegate:
-            (id<RTCSessionDescriptonDelegate>)delegate
+            (id<RTCSessionDescriptionDelegate>)delegate
                      sessionDescription:(RTCSessionDescription*)sdp {
   talk_base::scoped_refptr<webrtc::RTCSetSessionDescriptionObserver> observer(
       new talk_base::RefCountedObject<webrtc::RTCSetSessionDescriptionObserver>(
@@ -163,7 +164,7 @@ class RTCSetSessionDescriptionObserver : public SetSessionDescriptionObserver {
 }
 
 - (void)setRemoteDescriptionWithDelegate:
-            (id<RTCSessionDescriptonDelegate>)delegate
+            (id<RTCSessionDescriptionDelegate>)delegate
                       sessionDescription:(RTCSessionDescription*)sdp {
   talk_base::scoped_refptr<webrtc::RTCSetSessionDescriptionObserver> observer(
       new talk_base::RefCountedObject<webrtc::RTCSetSessionDescriptionObserver>(
diff --git a/talk/app/webrtc/objc/public/RTCPeerConnection.h b/talk/app/webrtc/objc/public/RTCPeerConnection.h
index c66bac8b4c..45e0a932c3 100644
--- a/talk/app/webrtc/objc/public/RTCPeerConnection.h
+++ b/talk/app/webrtc/objc/public/RTCPeerConnection.h
@@ -32,7 +32,7 @@
 @class RTCMediaConstraints;
 @class RTCMediaStream;
 @class RTCSessionDescription;
-@protocol RTCSessionDescriptonDelegate;
+@protocol RTCSessionDescriptionDelegate;
 
 // RTCPeerConnection is an ObjectiveC friendly wrapper around a PeerConnection
 // object.  See the documentation in talk/app/webrtc/peerconnectioninterface.h.
@@ -67,25 +67,25 @@
 - (void)removeStream:(RTCMediaStream *)stream;
 
 // Create a new offer.
-// Success or failure will be reported via RTCSessionDescriptonDelegate.
-- (void)createOfferWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+// Success or failure will be reported via RTCSessionDescriptionDelegate.
+- (void)createOfferWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                     constraints:(RTCMediaConstraints *)constraints;
 
 // Create an answer to an offer.
-// Success or failure will be reported via RTCSessionDescriptonDelegate.
-- (void)createAnswerWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+// Success or failure will be reported via RTCSessionDescriptionDelegate.
+- (void)createAnswerWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                      constraints:(RTCMediaConstraints *)constraints;
 
 // Sets the local session description.
-// Success or failure will be reported via RTCSessionDescriptonDelegate.
+// Success or failure will be reported via RTCSessionDescriptionDelegate.
 - (void)
-    setLocalDescriptionWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+    setLocalDescriptionWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                  sessionDescription:(RTCSessionDescription *)sdp;
 
 // Sets the remote session description.
-// Success or failure will be reported via RTCSessionDescriptonDelegate.
+// Success or failure will be reported via RTCSessionDescriptionDelegate.
 - (void)
-    setRemoteDescriptionWithDelegate:(id<RTCSessionDescriptonDelegate>)delegate
+    setRemoteDescriptionWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                   sessionDescription:(RTCSessionDescription *)sdp;
 
 // Restarts or updates the ICE Agent process of gathering local candidates
diff --git a/talk/app/webrtc/objc/public/RTCSessionDescriptonDelegate.h b/talk/app/webrtc/objc/public/RTCSessionDescriptionDelegate.h
similarity index 91%
rename from talk/app/webrtc/objc/public/RTCSessionDescriptonDelegate.h
rename to talk/app/webrtc/objc/public/RTCSessionDescriptionDelegate.h
index 409aaee5d6..ecdc581f5e 100644
--- a/talk/app/webrtc/objc/public/RTCSessionDescriptonDelegate.h
+++ b/talk/app/webrtc/objc/public/RTCSessionDescriptionDelegate.h
@@ -33,9 +33,9 @@
 extern NSString* const kRTCSessionDescriptionDelegateErrorDomain;
 extern int const kRTCSessionDescriptionDelegateErrorCode;
 
-// RTCSessionDescriptonDelegate is a protocol for listening to callback messages
-// when RTCSessionDescriptions are created or set.
-@protocol RTCSessionDescriptonDelegate<NSObject>
+// RTCSessionDescriptionDelegate is a protocol for listening to callback
+// messages when RTCSessionDescriptions are created or set.
+@protocol RTCSessionDescriptionDelegate<NSObject>
 
 // Called when creating a session.
 - (void)peerConnection:(RTCPeerConnection *)peerConnection
diff --git a/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.h b/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.h
index 18d7902886..8631f01704 100644
--- a/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.h
+++ b/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.h
@@ -27,14 +27,14 @@
 
 #import <Foundation/Foundation.h>
 
-#import "RTCSessionDescriptonDelegate.h"
+#import "RTCSessionDescriptionDelegate.h"
 
 @class RTCSessionDescription;
 
 // Observer of SDP-related events, used by RTCPeerConnectionTest to check
 // expectations.
 @interface RTCSessionDescriptionSyncObserver : NSObject<
-    RTCSessionDescriptonDelegate>
+    RTCSessionDescriptionDelegate>
 
 // Error string.  May be nil.
 @property(atomic, copy) NSString *error;
diff --git a/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.m b/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.m
index 75a4671b13..6d782536c6 100644
--- a/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.m
+++ b/talk/app/webrtc/objctests/RTCSessionDescriptionSyncObserver.m
@@ -71,7 +71,7 @@
   [self.condition unlock];
 }
 
-#pragma mark - RTCSessionDescriptonDelegate methods
+#pragma mark - RTCSessionDescriptionDelegate methods
 - (void)peerConnection:(RTCPeerConnection*)peerConnection
     didCreateSessionDescription:(RTCSessionDescription*)sdp
                           error:(NSError*)error {
diff --git a/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.h b/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.h
index 3e6d600bb4..dd810f74c0 100644
--- a/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.h
+++ b/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.h
@@ -29,7 +29,7 @@
 
 #import "GAEChannelClient.h"
 #import "APPRTCAppClient.h"
-#import "RTCSessionDescriptonDelegate.h"
+#import "RTCSessionDescriptionDelegate.h"
 #import "RTCVideoSource.h"
 // Used to send a message to an apprtc.appspot.com "room".
 @protocol APPRTCSendMessage<NSObject>
@@ -48,7 +48,7 @@
 @interface APPRTCAppDelegate : UIResponder<ICEServerDelegate,
                                            GAEMessageHandler,
                                            APPRTCSendMessage,
-                                           RTCSessionDescriptonDelegate,
+                                           RTCSessionDescriptionDelegate,
                                            UIApplicationDelegate>
 
 @property(strong, nonatomic) UIWindow* window;
diff --git a/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m b/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m
index e251816728..e6add76de1 100644
--- a/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m
+++ b/talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m
@@ -357,7 +357,7 @@
   [self closeVideoUI];
 }
 
-#pragma mark - RTCSessionDescriptonDelegate methods
+#pragma mark - RTCSessionDescriptionDelegate methods
 
 // Match |pattern| to |string| and return the first group of the first
 // match, or nil if no match was found.
diff --git a/talk/libjingle.gyp b/talk/libjingle.gyp
index d61ac15205..3c64ded9c6 100755
--- a/talk/libjingle.gyp
+++ b/talk/libjingle.gyp
@@ -215,7 +215,7 @@
             'app/webrtc/objc/public/RTCPeerConnectionDelegate.h',
             'app/webrtc/objc/public/RTCPeerConnectionFactory.h',
             'app/webrtc/objc/public/RTCSessionDescription.h',
-            'app/webrtc/objc/public/RTCSessionDescriptonDelegate.h',
+            'app/webrtc/objc/public/RTCSessionDescriptionDelegate.h',
             'app/webrtc/objc/public/RTCTypes.h',
             'app/webrtc/objc/public/RTCVideoCapturer.h',
             'app/webrtc/objc/public/RTCVideoRenderer.h',