%general-entities; ]> Sometimes, a change will make something no longer appropriate, but you think that it might be needed in the future. If you comment it out in the normal way, and start the comment with a FIXME: marker, that will be highlighted whenever the file is edited, at least if you use vim. If you encounter a FIXME: in a comment, do not automatically assume that it can be deleted because the following instructions have now been commented out. Note that there is no example here - the rendering of html strips out comments, and an empty box looks silly. As always, render your local copy after you comment something out, so that you can see the result!