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L4981 Boost PFC diode snubber circuit with zener diode added?

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Stops the boost diode anode going more than 48V below gnd - due to action of turn on passive snubber ...

i.e. stops the boost diode from blowing up ...
 

    T

    Points: 2
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Thanks yes, but wouldnt D5 on its own stop it from blowing up?
ie, D5 could carry the L2 current after Q1,2 switch OFF, D6 neednt be there.
I can see D6 does no particular harm.
Perhaps its just to make L3 discharge quicker?
 

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