  In this note we complement a part of a theorem of Fontaine-Mazur. We show
that if $(V,\rho)$ is an irreducible finite dimensional representation of the
Galois group $Gal({\bar K}/K)$ of a finite extension of $K\Q_p$, of Hodge-Tate
type $(0,1)$ then it is potentially semi-stable if and only if it is
potentially crystalline. This was proved by Fontaine-Mazur for dimension two
and $p\geq 5$ by their classfication theorem.
