-@deffn Command beginning-of-defun &optional arg
-This function moves back to the @var{arg}th beginning of a defun. If
-@var{arg} is negative, this actually moves forward, but it still moves
-to the beginning of a defun, not to the end of one. @var{arg} defaults
-to 1 if omitted.
+@deffn Command beginning-of-defun &optional count
+This function moves back to the @var{count}th beginning of a defun.
+If @var{count} is negative, this actually moves forward, but it still
+moves to the beginning of a defun, not to the end of one. @var{count}
+defaults to 1 if omitted.