COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Konkoly Observatory Budapest 22 November 2004 Announcement New ephemerides on variable stars are published only if major revision of the current ephemeris has became possible on the ground of new observations. Therefore the elements of the stars and consequently the O-C values will not appear in the "Times of minima" papers. In case of a major change of the period either a short note to the "Observations of / Information on Variables" section (also in tabulated form for a list of objects), or a full, detailed paper to the main section, can be submitted. New variables and/or new ephemeris of variables resulting exclusively from data mining will be published in the future in collected forms, that are printed once in every 100 issues. Normal minima times from data mining are not accepted. The Editors