You can add notes to a read code in the Data tab of an opened document, under the section Read Codes. You can do this by hovering over the code and clicking the button with the three dots (next to the X). This will open up a menu that allows you to a add a note.
Add source as note will allow the quotation italicised in grey as the note for the code.
Once you’re happy with the note you've typed, click Confirm.
The note will then appear at the bottom of the code.
