When users create a new account via the standard sign-up form, the username field currently lacks any description about format limitations (e.g., lowercase only).

We have encountered confusion from end users who unknowingly include uppercase letters, resulting in login issues or duplicate account creation.

Request: Add a helper description beneath the username field (similar to the password field) that explains formatting requirements — especially the lowercase only rule, which is enforced by default in Moodle.

Example suggested text:

"Username must be in lowercase and cannot contain spaces or special characters."

This would help reduce support tickets and improve user onboarding clarity.