iCloud Keychain makes it easier to remember your passwords without having to guess the website or username depending on the information available. This can be done by adding notes to existing app and website passwords in iCloud Keychain.
Add notes to saved usernames and passwords on Mac, iPad, and iPhone
In this post, we'll explain how to add notes to the passwords in the iCloud Keychain you have saved on your iPhone.
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There are a few requirements you need to meet in order to use this new feature in iCloud Keychain.