To tag image files, mark them in the dired buffer (you can also mark
files in Dired from the thumbnail buffer by typing @kbd{m}) and type
-@kbd{C-t t} (@code{image-dired-tag-files}). You will be prompted for
-a tag. To mark files having a certain tag, type @kbd{C-t f}
+@kbd{C-t t} (@code{image-dired-tag-files}). This reads the tag name
+in the minibuffer. To mark files having a certain tag, type @kbd{C-t f}
(@code{image-dired-mark-tagged-files}). After marking image files
with a certain tag, you can use @kbd{C-t d} to view them.