When this option is available, it indicates that the graphic being viewed has comments embedded in it. Select it to view and/or modify these comments.
If the image does not have comments, the selection reads Edit | Add Comments.
Comments can be saved in the following types of files:
GIF - Version 89a comment field.
JPEG - COM marker field(s).
TIFF - Description tag.
PNG - Text fields.
This option is provided for older file types. Many other file formats accept XMP comments and metadata, which you can change on the Info tab or in Edit -
Font. Click this button to set the desired display font for this dialog box.
Save. Click this button to save the comments to en external text file.