This version includes bug fixes from version 11.1
iOS users have found themselves at the mercy of an odd software bug after updating to iOS 11.1 where the “i” would be turned into the letter “a” and an odd character. Today, Apple has released a new version of iOS — 11.1.1 — that takes care of that issue.
The software update can be downloaded new by going to Settings > General > Software Update. Other than the descriptive information on the update screen, there are no other details on the update.