I use Emacs to edit LaTeX source. I preface notes which I have made with
% as required, so that they are considered as comments. These lines appear in Emacs in a different face.
However, when working on a document, I sometimes would like to highlight/indicate/mark certain lines so that they appear in a different face. For example, if I am done with a section of notes I have made, but would like to keep these in the source file, I would like to "flag" these lines so that they appear in a different face in Emacs.
Is there a way to do this? Any solution would obviously still need to be considered valid LaTeX code. Maybe lines starting with
%% could use a different face?