diff --git a/modules/mesh-build-node/cmd/mesh-build-node/package.go b/modules/mesh-build-node/cmd/mesh-build-node/package.go
index 7f167d8d5..851637b5d 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/package.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/package.go
@@ -222,7 +222,9 @@ func (m *Module) buildAndPack(ctx context.Context, root, dir, rel string, write
 // groupPackage is the fetch's `package` argument: the group's package member (ADR 0500 §5), which the fetch packs and
 // serves to its TypeScript members in place of the registry's version, or, by Name and Version, the group's tagged
 // version of the SDK, which the fetch places from the registry in each TypeScript member, whatever version its lock
-// names (novox/hq ADR 0607 §3, §5; design 51 *Tagged versions*): nothing is packed then.
+// names (novox/hq ADR 0607 §3, §5; design 51 *Tagged versions*): nothing is packed then. The packed member is the old
+// form, kept because the running checker hands it until the checker that hands the tagged version is delivered; its
+// removal is a subtask of the milestone after that delivery (issue 1966).
 type groupPackage struct{ Repository, Commit, Ref, Name, Version string }
 
 // tagged says whether the argument names a tagged version to take from the registry, not a member to pack.