I have a comment form, in which I want to avoid spam by requiring at least 15 characters. So far my users have been confused and assumed that it meant you could only write 15 characters maximum.
The UI is as follows:
This number updates as you write and goes down one by one per letter.
Now, once you write 15 characters the warning disappears and you can post the comment. Unfortunately, as I said people think this means that there is a limit of maximum characters.
How do I convey that it's minimum, not maximum?