Sigma 10-20mm F4-5.6 - HSM for Pentax?

I'm selling one of these on ebay and have had a query about whether it is the HSM version. From looking around Sigma don't seem to have made an HSM version for Pentax - is that right?

Hope so because the ebay predictive text has listed mine as an HSM version and I might have to pull the auction if I have mis-described it. I won't feel so bad if there was never such a lens

Thanks in advance!

Hsm version for pentax has a constant ap of F3.5
(Sigma EX Wide-angle zoom lens - 10 mm - 20 mm - F/3.5 - Pentax K )

cheers - that's the conclusion i was coming to. thanks for confirming