* test/src/image-tests.el: Doc fix; explain how to run from
command line.
;;; Commentary:
;; Most of these tests will only run in a GUI session, and not with
-;; "make check". Run them manually in an interactive session with
-;; `M-x eval-buffer' followed by `M-x ert'.
+;; "make check". You must run them manually in an interactive session
+;; with, for example, `M-x eval-buffer' followed by `M-x ert'.
+;;
+;; To run these tests from the command line, try:
+;; ./src/emacs -Q -l test/src/image-tests.el -eval "(ert t)"
;;; Code: