diff --git a/index.js b/index.js
index 15dc3ff85..1b66c6c10 100644
--- a/index.js
+++ b/index.js
@@ -859,6 +859,9 @@ const createClient = (profile, userAgent, opt = {}) => {
 	const disableSubscription = _setSubscriptionStatus.bind(null, 'EXPIRED')
 	const enableSubscription = _setSubscriptionStatus.bind(null, 'ACTIVE')
 
+	// todo: subscribeToJourneysInterval
+	// https://gist.github.com/derhuerst/d267ac179e49e927d38daa1a4bdf7760#file-6-subscriptions-http-L81-L132
+
 	const subscribeToJourney = async (userId, channelIds, journeyRefreshToken, opt = {}) => {
 		if (!isNonEmptyString(userId)) {
 			throw new TypeError('userId must be a non-empty string')
diff --git a/parse/journey.js b/parse/journey.js
index 1c8aba307..33702c5d9 100644
--- a/parse/journey.js
+++ b/parse/journey.js
@@ -22,7 +22,7 @@ const parseScheduledDays = (sDaysB, year, profile) => {
 	return res
 }
 
-// todo: c.conSubscr (e.g. `F`)
+// todo: c.conSubscr (e.g. `F`, `U`) – is this journey subscribed to?
 // todo: c.trfRes x vbb-parse-ticket
 // todo: c.sotRating, c.isSotCon, c.sotCtxt
 // todo: c.showARSLink