An error message should start with a capital letter but should not end
with a period.
+@item
+A question asked in the minibuffer with @code{y-or-n-p} or
+@code{yes-or-no-p} should start with a capital letter and end with
+@samp{? }.
+
+@item
+When you mention a default value in a minibuffer prompt,
+put it and the word @samp{default} inside parentheses.
+It should look like this:
+
+@example
+Enter the answer: (default 42)
+@end example
+
@item
In @code{interactive}, if you use a Lisp expression to produce a list
of arguments, don't try to provide the ``correct'' default values for