From LQWiki

The command diction filename.txt will annotate your document with pre-formatted questions about stylistic considerations. The text document for editing the formatted responses is easy enough to use. The biggest limitation of this command, from a heavy text editor's perspective, is that diction doesn't appear to have a way of adding more regex rules to the diction application. For example, there is no way to search for all prepositions in a sentence that have a period at the end.