From The Document Foundation Wiki
- If the subcomponent can be confused with parts of a word (for example, UI is part of the word quit), surround the subcomponent with square brackets.
- Use at most two subcomponents.
- Use subcomponents exactly as they appear in the list, but you may integrate them into the subject line sentence like “WIKIHELP [UI] not available in all languages”.
- Summarize the problem fairly precisely.