diff --git a/encoding/gocode/doc.go b/encoding/gocode/doc.go
new file mode 100644
index 0000000..7bf0af6
--- /dev/null
+++ b/encoding/gocode/doc.go
@@ -0,0 +1,20 @@
+// Copyright 2019 CUE 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 gocode defines functions for extracting CUE definitions from Go code
+// and generating Go code from CUE values.
+//
+// This package is used for offline processing. For converting Go values to and
+// from CUE at runtime, use the gocodec package.
+package gocode