diff --git a/doc.go b/doc.go
new file mode 100644
index 0000000..6c623c8
--- /dev/null
+++ b/doc.go
@@ -0,0 +1,5 @@
+// Copyright (c) 2023, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+// gofumpt enforces a stricter format than gofmt, while being backwards compatible.
+package main