gm-notes VS fvtt-split-journal

GM Notes has done well for me. Lets you add a little pinned text box to any object that only the GM can see (button for it's up at the top of the relevant object window)

check GM Notes, its compatible with 9.x

GM Notes

"update to 0.5 · syl3r86/gm-notes@0e5cba0 · GitHub" https://github.com/syl3r86/gm-notes/commit/0e5cba0d4a33122da7e72b3c16ff5d6457ea6d8d

The GM Notes module adds a special notes section to actors, items and more. It doesn't pop them out automatically though. You still need to go into the actor's sheet.

I use the GM notes module (https://github.com/syl3r86/gm-notes). It adds a new tab to all entities like actors, journal entries, items and so on where the GM can write notes which are visible only to himself

you can just drop the journal with the room description on your map and directly click on it to read the note, a few modules can help (but not needed) :automatic journal icon numbers will automatically add an easy readable number to the journal note icon (the note name has to contain the room number) , Split Journal if you have all your room descriptions in a single journal this will help to split it in single rooms, Pin Cushion will show the note text on mouseover and help with icon placement on the map (this fork fixes some bug with v9.x)

Split Journal