diff --git a/cif/types.go b/cif/types.go
index 48aaa28..ddc2839 100644
--- a/cif/types.go
+++ b/cif/types.go
@@ -2,6 +2,9 @@ package cif
 
 import "git.fjla.uk/owlboard/go-types/pkg/upstreamApi"
 
+// This file is for internal types to `package cif`, any types which represent
+// database or external API resources should be defined in git.fjla.uk/owlboard/go-types
+
 // Holds parsed data for processing
 type parsedData struct {
 	header upstreamApi.JsonTimetableV1