-automatically every time a file is saved. This is accomplished by putting
-@code{(add-hook 'write-file-functions 'copyright-update)} into your @file{~/.emacs}
-file (@pxref{(emacs)Init File}).
+automatically every time a file is saved. This is accomplished by
+putting @code{(add-hook 'before-save-hook 'copyright-update)} into
+your @file{~/.emacs} file (@pxref{(emacs)Init File}). Alternative,
+you can do @kbd{M-x customize-variable @key{RET} before-save-hook
+@key{RET}}. @code{copyright-update} is conveniently listed as an
+option in the customization buffer.