Template:Warning1

Usage
This template should be placed on the talk page of a user who has made one or more edits that appear to be in good faith, but which had relatively damaging consequences (e.g. accidentally breaking a template). Be sure to include a reason for the warning, specifying the nature of the edits that let to it. Most of all, be nice, and be sure to include your signature underneath so they know who to respond to if they want to ask for help in avoiding repeat incidents.

For edits that are clearly not good faith, use Template:Warning2.