Update src/manifest.js

Co-authored-by: Garrett Singer <gesinger@gmail.com>

src/manifest.js

@@ -286,9 +286,9 @@ export const addPropertiesToMaster = (master, uri) => {
 
  // add a playlist array under properties
  if (!properties.playlists || !properties.playlists.length) {
- // if we have an audio only master and this media group does not have a uri.
- // check if it is located in the real list. If it is don't add placeholder
- // properties as we should never switch to it.
+ // If the manifest is audio only and this media group does not have a uri, check
+ // if the media group is located in the main list of playlists. If it is, don't add
+ // placeholder properties as it shouldn't be considered an alternate audio track.
  if (audioOnlyMaster && mediaType === 'AUDIO' && !properties.uri) {
  for (let i = 0; i < master.playlists.length; i++) {
  const p = master.playlists[i];