From VFXPedia

Comment Tab

The Comment Tab is marked by a small blue icon that contains the letter I in white. This tab is found on every tool. It contains a single text control that is used to add comments and notes to the tool. Click in the entry area and type the text.

When a note is added to a tool, a small blue icon with the letter I appears on the control header. To see the note in the flow, hold the cursor over the tool tile for a moment. The contents of the comments tab can be animated over time, if required.

Additional controls appear under this tab if the tool is a Loader. See the Creator Tools chapter for details.