diff --git a/widgets/linechart/axes/label.go b/widgets/linechart/axes/label.go
index d571c44..13e8c33 100644
--- a/widgets/linechart/axes/label.go
+++ b/widgets/linechart/axes/label.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package axes
 
 // label.go contains code that calculates the positions of labels on the axes.
diff --git a/widgets/linechart/axes/label_test.go b/widgets/linechart/axes/label_test.go
index 337b981..a1bfdae 100644
--- a/widgets/linechart/axes/label_test.go
+++ b/widgets/linechart/axes/label_test.go
@@ -1,3 +1,17 @@
+// Copyright 2019 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package axes
 
 import (