(defun gnus-group-read-group (&optional all no-article group select-articles)
"Read news in this newsgroup.
If the prefix argument ALL is non-nil, already read articles become
-readable. IF ALL is a number, fetch this number of articles. If the
-optional argument NO-ARTICLE is non-nil, no article will be
-auto-selected upon group entry. If GROUP is non-nil, fetch that
-group."
+readable.
+
+If ALL is a positive number, fetch this number of the latest
+articles in the group. If ALL is a negative number, fetch this
+number of the earliest articles in the group.
+
+If the optional argument NO-ARTICLE is non-nil, no article will
+be auto-selected upon group entry. If GROUP is non-nil, fetch
+that group."
(interactive "P")
(let ((no-display (eq all 0))
(group (or group (gnus-group-group-name)))