diff --git a/hcl2template/addrs/doc.go b/hcl2template/addrs/doc.go
new file mode 100644
index 000000000..13c300030
--- /dev/null
+++ b/hcl2template/addrs/doc.go
@@ -0,0 +1,11 @@
+// Package addrs contains types that represent "addresses", which are
+// references to specific objects within a Packer configuration.
+//
+// All addresses have string representations based on HCL traversal syntax
+// which should be used in the user-interface, and also in-memory
+// representations that can be used internally.
+//
+// All types within this package should be treated as immutable, even if this
+// is not enforced by the Go compiler. It is always an implementation error
+// to modify an address object in-place after it is initially constructed.
+package addrs