Annotate books in the Books app on iPhone
You can highlight, underline, and take notes as you read books in the Books app .

Highlight or underline text
Touch and hold a word, then move the grab points to adjust the selection.
Tap Highlight.
To change the highlight color or switch to underline, tap the text, tap Highlight, then tap an option.
To remove a highlight or underline, tap the text, then tap Remove.
To see all of your highlights, tap the page, tap , tap Bookmarks & Highlights, then tap Highlights.
Add a note
Touch and hold a word, then move the grab points to adjust the selection.
Tap Add Note, enter text, then tap Done.
The selected text is highlighted.
To remove a note, tap the text, then tap Remove. Both the note and the highlight are removed.
To see all of your notes, tap the page, tap , tap Bookmarks & Highlights, then tap Highlights.