@minhflyakite sorry - there isn't one right now, but I've made a note to add that to the howto page
@minhflyakite just edit the one that's there, based on the source of the read later bookmarklet
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
@minhflyakite just edit the one that's there, based on the source of the read later bookmarklet