  In this note, we prove a fractional version in $1$-D of the Bourgain-Brezis
inequality \cite{bourgain1}. We show that such an inequality is equivalent to
the fact that a holomorphic function $f\colon\D\to\C$ belongs to the Bergman
space ${\mathcal{A}}^2(\D)$, namely $f\in L^2(\D)$, if and only if $$\|f\|_{
L^1+ {H}^{-1/2}(S^1)}:=\limsup_{r\to 1^-}\|f(re^{i\theta})\|_{ L^1+
{H}^{-1/2}(S^1)}<+\infty.$$ Possible generalisations to the higher-dimensional
torus are explored.
