To make a note in an open iBooks file, press down on the iPad’s screen to select the word or phrase you want to annotate.
In the menu bar that appears above your selected text, tap the Note button to create a digital sticky note and use the iPad keyboard to type in your thoughts.
Tap the shrunken note to expand it so you can review your annotations.
Penguin Classics, that more-than-1,500-titles collection of English-language literary classics, has a new free app for iOS devices available on Tuesday.