**Abstract: **We prove a version of Hardy's type inequality
in a domain $\Omega\subset \mathbb R^n$ which involves the distance
to the boundary and the volume of $\Omega$. In particular,
we obtain a result which gives a positive
answer to a question asked by H. Brezis and M. Marcus.
The results are contained in a joint paper with M. Hoffmann-Ostenhof and
T. Hoffmann-Ostenhof which appeared in Journal of Functional Analysis
Vol. 189, No. 2, March 10, 2002