The 1-kg rule went into effect on May 1st, and the International Weightlifting Federation has offered a summary of how this works.

Up to this point, the weight on the barbell was increased in 2.5-kg increments, except for records, where 0.5-kg increments could be used. In this era, the weights counted within the competition only included the 2.5-kg increment, not the additional record-setting increments, which was sometimes the basis for confusion among people not familiar with the details of this rule.

Beginning May 1, the weight on the bar can be increased in 1-kg increments, whether within competition or for records, and the actual weight lifted will be counted for the best snatch, clean and jerk, and total - both in the competition and for records.

Please check the IWF website for details.