After you ban someone, not ctban someone, you will need to post a comment on sourcebans saying exactly what they did.
The purpose of this is to allow quick banning and good organization. Many times admins have to quickly ban someone and under the ban's reason, they may quickly put in some random letters.
Therefore, I ask all admins to post comments on sourcebans after banning.
How?

First go to http://198.100.154.225/sourcebans/index.php?p=home
Log in to your account.
Click on "ban list" tab on the top.
Click on the ban that you want to post a comment on.
There should be a table that pops up along with an "add comment" option.
Type in your reason for banning and post!