additive property of diode

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What do you mean by additive property of diode? 

In full wave Centre tapped rectifier , two diodes are used D1 and D2 during the positive half cycle of secondary voltage . That diode D1 is forward bias and D2 is Reverse Biased, then the current flow in the direction of load . During negative half cycle due to becomes forward bias and then becomes reverse Biased then the direction of current is same as direction of current in positive cycle flowing in load . Hence, the direction of load current in both cases are same. This property of centre tapped rectifier is known as as  additive property of diode. 

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