diff --git a/lib/request.js b/lib/request.js
index 24ea83d0..bc8f25f3 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -163,7 +163,9 @@ const request = async (ctx, userAgent, reqData) => {
 	const res = await fetch(url, req)
 
 	const errProps = {
+		// todo [breaking]: assign as non-enumerable property
 		request: fetchReq,
+		// todo [breaking]: assign as non-enumerable property
 		response: res,
 		url,
 	}
diff --git a/parse/journey-leg.js b/parse/journey-leg.js
index 22b887cc..9146a82b 100644
--- a/parse/journey-leg.js
+++ b/parse/journey-leg.js
@@ -148,6 +148,7 @@ const parseJourneyLeg = (ctx, pt, date) => { // pt = raw leg
 
 		const freq = pt.jny.freq || {}
 		// todo: expose `res.cycle` even if only one field exists (breaking)
+		// todo [breaking]: rename to something more intuitive, e.g. res.headways.{min,max,nrOfTrips}
 		if (freq.minC && freq.maxC) {
 			res.cycle = {
 				min: freq.minC * 60,