Add copyright headers and docstrings

diff --git a/internal_deps.bzl b/internal_deps.bzl
index e7a509b..463c1f8 100644
--- a/internal_deps.bzl
+++ b/internal_deps.bzl

@@ -1,4 +1,21 @@
+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+"""Dependencies that are needed for rules_java tests and tools."""
+
 load("@bazel_federation//:repositories.bzl", "rules_pkg")
 
 def rules_java_internal_deps():
+    """Fetches all required dependencies for rules_java tests and tools."""
     rules_pkg()

diff --git a/internal_setup.bzl b/internal_setup.bzl
index d8cf052..8c8ea19 100644
--- a/internal_setup.bzl
+++ b/internal_setup.bzl

@@ -1,2 +1,18 @@
+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+"""Setup for rules_java tests and tools."""
+
 def rules_java_internal_setup():
     pass  # placeholder for the federation