-nonblank character on the line. There is no need to change @kbd{C-a},
-as the choice of screen model does not affect beginnings of
-lines.
+nonblank character on the line. @kbd{C-a} runs
+@code{picture-beginning-of-line}. (The choice of screen model does not
+affect beginnings of lines; the only extra thing this command does is
+update the current picture column to 0.)