diff --git a/models/project.go b/models/project.go
index f7f325c..5aff527 100644
--- a/models/project.go
+++ b/models/project.go
@@ -1,22 +1,24 @@
 // SPDX-FileCopyrightText: 2017-2020 Harald Sitter <sitter@kde.org>
 // SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 package models
 
 // Project is the core model of a project entity.
 type Project struct {
 	// TODO v2 omitempty
 	I18n I18nData `yaml:"i18n" json:"i18n"`
 
 	// With the migration to invent projectpath became useless. It's the legacy
 	// path for awkward reasons. Instead publish the real on disk path and
 	// expose the legacy path under a different name.
 	PathOnDisk string `yaml:"-" json:"path"`
 	// TODO v2 throw away hopefully (depends on metadata getting better replacement
+	// Used by:
+	// - kde-org-applications-extractor (needed to map to ci-tooling data)
 	PathInMetadata string `yaml:"projectpath" json:"__do_not_use-legacy-projectpath,omitempty"`
 
 	Repo string `yaml:"repopath" json:"repo"`
 	// TODO v2 throw away hopefully (depends on metadata getting better replacement)
 	Active     bool   `yaml:"repoactive" json:"-"`          // do not marshal to json, we presently have no use case for it
 	Identifier string `yaml:"identifier" json:"identifier"` // also marshal'd via I18nData
 }