Did you know that you can annotate photos on your iPhone and iPad? Thanks to the built-in Markup feature in iOS, you don’t even need to install a third-party application like Annotable or Skitch from the App Store.

This tool can come in handy when you have to annotate your screenshots, sign documents or add a caption to your photos. It was first introduced in iOS a few years ago, but Apple has kept improving it over time by adding more features and making incremental changes to the interface. From adding texts to sketching with brushes, Markup offers a…