added note: how to check is the ZC driver is loaded
added note: how to check is the ZC driver is loaded

ntop/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,opencTM/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING