I'm writing a document describing what has been added or changed in a new version of a software app. Among the changes are new features allowing the users to do certain things.
(1) Is it correct to say "Implemented an option allowing..." or should it be "Implemented the option allowing..."? (2) Is it better to say "Added a 'XXX' section where you can see..." or should it be "Added the 'XXX' section where you can..."?
Note: The features listed in the changelogs haven’t been mentioned somewhere before by app's developers