diff --git a/ch06/chapter06.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate b/ch06/chapter06.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate
index e1437e6..e303281 100644
Binary files a/ch06/chapter06.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate and b/ch06/chapter06.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/ch06/chapter06/MetalView.swift b/ch06/chapter06/MetalView.swift
index 8689c5d..7570bd4 100755
--- a/ch06/chapter06/MetalView.swift
+++ b/ch06/chapter06/MetalView.swift
@@ -1,7 +1,7 @@
 //
 //  MetalView.swift
 //  chapter06
-//
+// 
 //  Created by Marius on 2/10/16.
 //  Copyright © 2016 Marius Horga. All rights reserved.
 //
diff --git a/ch07/chapter07.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate b/ch07/chapter07.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate
index ccf83e0..c961a24 100644
Binary files a/ch07/chapter07.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate and b/ch07/chapter07.xcodeproj/project.xcworkspace/xcuserdata/marius.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/ch07/chapter07/MetalView.swift b/ch07/chapter07/MetalView.swift
index fd1add0..b20b49c 100644
--- a/ch07/chapter07/MetalView.swift
+++ b/ch07/chapter07/MetalView.swift
@@ -1,7 +1,7 @@
 //
 //  MetalView.swift
 //  chapter07
-//
+// 
 //  Created by Marius on 2/29/16.
 //  Copyright © 2016 Marius Horga. All rights reserved.
 //