diff --git a/common/block.go b/common/block.go
index db3d44d..b16a057 100644
--- a/common/block.go
+++ b/common/block.go
@@ -1,3 +1,7 @@
+// Copyright 2014, 2015 by Sascha L. Teichmann
+// Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
 package common
 
 import (
diff --git a/common/colors.go b/common/colors.go
index c06e888..cfea39f 100644
--- a/common/colors.go
+++ b/common/colors.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/coords.go b/common/coords.go
index 6aea9dc..a09bde1 100644
--- a/common/coords.go
+++ b/common/coords.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/coords_test.go b/common/coords_test.go
index 519ac4a..0bdd87b 100644
--- a/common/coords_test.go
+++ b/common/coords_test.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/coverage.go b/common/coverage.go
index 1146aab..ac7a3a4 100644
--- a/common/coverage.go
+++ b/common/coverage.go
@@ -1,3 +1,7 @@
+// Copyright 2014, 2015 by Sascha L. Teichmann
+// Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
 package common
 
 import "sync"
diff --git a/common/image.go b/common/image.go
index 8ac0d98..69c43fa 100644
--- a/common/image.go
+++ b/common/image.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/math.go b/common/math.go
index cdae591..321346e 100644
--- a/common/math.go
+++ b/common/math.go
@@ -1,3 +1,7 @@
+// Copyright 2014, 2015 by Sascha L. Teichmann
+// Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
 package common
 
 func Max(a, b int) int {
diff --git a/common/redisclient.go b/common/redisclient.go
index ec528e6..fe6a25e 100644
--- a/common/redisclient.go
+++ b/common/redisclient.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/renderer.go b/common/renderer.go
index 526e4ac..1912ac6 100644
--- a/common/renderer.go
+++ b/common/renderer.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/spans.go b/common/spans.go
index 7623a86..26748d8 100644
--- a/common/spans.go
+++ b/common/spans.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.
 
diff --git a/common/spans_test.go b/common/spans_test.go
index ffd8061..db513e5 100644
--- a/common/spans_test.go
+++ b/common/spans_test.go
@@ -1,4 +1,4 @@
-// Copyright 2014 by Sascha L. Teichmann
+// Copyright 2014, 2015 by Sascha L. Teichmann
 // Use of this source code is governed by the MIT license
 // that can be found in the LICENSE file.