1. 1.0 PurposeThe Updates feature is to let people know that you have made a major change or update to your submission. Adding an update to your submission will also bump it to the top of the new queue again.
2. 1.1 Major UpdatesThe updates feature should only be used if you have made significant changes to your submission. Small tweaks or changes should not be submitted as new updates. Changing the description, screenshots, credits etc would also not qualify as a major update.
Please also be considerate when using the updates feature, as it will push the submission to the top of the new queue. Try to avoid updating multiple submissions in a short period of time and make sure to only use the updates feature for major updates.