We reconsider two hypotheses used in calculating the transfer of angul
ar momentum between the oceans and the solid Earth: (1) The locked-oce
an-hypothesis was already given up some time ago; here we provide a si
mple manner of understanding the relative importance of the motion and
matter term. (2) The isolation hypothesis implied the isolation of th
e whole Earth in short timescales with regard to angular momentum exch
ange, and consequently, the neglection of the exchange with the tide-g
enerating body. It is shown that for present accuracy requirements thi
s exchange has to be taken into account.