How do you document breakless cases?

[Lawrence V. Cipriani]

I'm trying to come up with a standard way to document
breakless case statements in the C code on my project.
I've seen four ways to do it:

    1) do nothing
    2) use the "lint-like" comment /* FALLTHROUGH */
	or /* FALLTHRU */ or /* FLOWTHRU */
    3) use a sentence in a comment
	eg /* a break is not used in this case */
    4) use a define, eg #define flowthru /* nothing */
	flowthru;

Anyone got other ideas on ways to do this?  Please e-mail
to me and I'll summarize the responses on 06/28.  If one
of these ways seems especially good or bad (except 1 which
everyone knows is poor right?) to you let me know that too.
Thanks,