diff --git a/retrieval/discovery/marathon.go b/retrieval/discovery/marathon.go
index a057e96e1..09b154991 100644
--- a/retrieval/discovery/marathon.go
+++ b/retrieval/discovery/marathon.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 discovery
 
 import (
diff --git a/retrieval/discovery/marathon/client.go b/retrieval/discovery/marathon/client.go
index 52ccbbf7a..486b87383 100644
--- a/retrieval/discovery/marathon/client.go
+++ b/retrieval/discovery/marathon/client.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 marathon
 
 import (
diff --git a/retrieval/discovery/marathon/constants.go b/retrieval/discovery/marathon/constants.go
index f9298d7be..4c6ffb8ec 100644
--- a/retrieval/discovery/marathon/constants.go
+++ b/retrieval/discovery/marathon/constants.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 marathon
 
 import (
diff --git a/retrieval/discovery/marathon/conversion.go b/retrieval/discovery/marathon/conversion.go
index 4acf499b9..14dd89e21 100644
--- a/retrieval/discovery/marathon/conversion.go
+++ b/retrieval/discovery/marathon/conversion.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 marathon
 
 import (
diff --git a/retrieval/discovery/marathon/objects.go b/retrieval/discovery/marathon/objects.go
index 7da743a51..22cf42630 100644
--- a/retrieval/discovery/marathon/objects.go
+++ b/retrieval/discovery/marathon/objects.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 marathon
 
 // Task describes one instance of a service running on Marathon.
diff --git a/retrieval/discovery/marathon/url.go b/retrieval/discovery/marathon/url.go
index 6fa49ae4d..b988ab52b 100644
--- a/retrieval/discovery/marathon/url.go
+++ b/retrieval/discovery/marathon/url.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 marathon
 
 import (
diff --git a/retrieval/discovery/marathon_test.go b/retrieval/discovery/marathon_test.go
index e980e11e7..8e1ceab20 100644
--- a/retrieval/discovery/marathon_test.go
+++ b/retrieval/discovery/marathon_test.go
@@ -1,3 +1,16 @@
+// Copyright 2015 The Prometheus Authors
+// 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 discovery
 
 import (