[Q] lollipop root? topic

I just updated my lg g3 to android 5.0 via OTA. I've been trying to find out how to root it, but all I can find online is to install UPDATE-SuperSU-v2.37.zip in the recovery mode and it seems to need TWRP which I don't have. When I tried to flash UPDATE-SuperSU-v2.37.zip via adb, I got messages saying signature verification failed. I'm wondering anyone here has successfully rooted lollipop on LG G3 here? Thanks.