Spell Notes
Spell Notes are personal text notes attached to a spell. The sticky-note icon on a Spell Book spell row opens the notes dialog, and a solid icon means a note exists. The icon appears only while Notes is enabled in Details Customization, which each user sets for their own client.

The counter shows characters remaining under the Maximum Note Length setting. Save is disabled while the text box is empty, so an existing note cannot be cleared by saving it blank.
Whose note
Section titled “Whose note”A note belongs to a user and a spell, not to an actor. It is shared across actors and survives removing and re-adding the spell.
A player always reads and writes their own notes. Two players sharing an actor each see only their own.
When the active GM opens a player’s character, the dialog reads and edits that player’s notes. The player is the user with that character assigned, or else a user with Owner permission. On an actor with no player owner, you use your own notes.
Description injection
Section titled “Description injection”The client setting Inject Notes into Spell Descriptions adds a note before or after the description of matching spells on actors. The note is written into the spell item’s description, so anyone who can view that item sees it.
Injection runs when a spell is added to an actor, when its description changes, and when a note is saved. Changing the setting does not update existing descriptions until one of those events occurs.