The Google Docs, Sheets and Slides iPhone and iPad apps gained collaborative commenting, which allows multiple users to add comments to keep everyone on the same page. The new feature, which will work on both Android and iOS devices, will allow co-workers to easily manage documents, make revisions, and ensure everyone is pleased with the outcome. New teammates can be added to the conversation by typing their name in a comment.

The new functionality is available starting now for both iOS and Android users.

Source: Google