diff --git a/hopOsxAppDelegate.h b/hopOsxAppDelegate.h
index e4664cf..84b84f4 100644
--- a/hopOsxAppDelegate.h
+++ b/hopOsxAppDelegate.h
@@ -1,9 +1,19 @@
+// Copyright 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>.
 //
-//  hopOsxAppDelegate.h
-//  hopOsx
+// This file is part of Hop.
 //
-//  Created by Tony Garnock-Jones on 2012-05-01.
-//  Copyright 2012 n/a. All rights reserved.
+// Hop is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation, either version 3 of the License, or (at your
+// option) any later version.
+//
+// Hop is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Hop.  If not, see <http://www.gnu.org/licenses/>.
 //
 
 #import <Cocoa/Cocoa.h>
diff --git a/hopOsxAppDelegate.m b/hopOsxAppDelegate.m
index bdc0dac..314c76b 100644
--- a/hopOsxAppDelegate.m
+++ b/hopOsxAppDelegate.m
@@ -1,9 +1,19 @@
+// Copyright 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>.
 //
-//  hopOsxAppDelegate.m
-//  hopOsx
+// This file is part of Hop.
 //
-//  Created by Tony Garnock-Jones on 2012-05-01.
-//  Copyright 2012 n/a. All rights reserved.
+// Hop is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation, either version 3 of the License, or (at your
+// option) any later version.
+//
+// Hop is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Hop.  If not, see <http://www.gnu.org/licenses/>.
 //
 
 #import "hopOsxAppDelegate.h"
diff --git a/main.m b/main.m
index bdcff02..d8e487f 100644
--- a/main.m
+++ b/main.m
@@ -1,9 +1,19 @@
+// Copyright 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>.
 //
-//  main.m
-//  hopOsx
+// This file is part of Hop.
 //
-//  Created by Tony Garnock-Jones on 2012-05-01.
-//  Copyright 2012 n/a. All rights reserved.
+// Hop is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation, either version 3 of the License, or (at your
+// option) any later version.
+//
+// Hop is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Hop.  If not, see <http://www.gnu.org/licenses/>.
 //
 
 #import <Cocoa/Cocoa.h>