Lightroom :: How To Add Notes To Some Pictures In Catalog

I would like to add notes to some pictures in my Lightroom catalog. I know how to use keywords, but in some cases keywords are not enough. For example if you want to note the names of a group of persons from left to right. You can enter the names as keywords, but then the names will be sort alphabetically - so you have the names, but later no information who is who on the picture! I would like to enter notes to some pictures, but don't know how I can do that in Lightroom? I think about many cases where notes would be useful. Another example is, if you would like to describe a situation, which the picture shows (What happened there? Background information to the picture or something like this). You only can enter keywords, but you are not able to enter some sentences. Any existing solution or could this be a new feature in Lightroom? I prefer to add notes to the Lightroom catalog not directly into the metadata (like EXIF or XMP).