Nvidia OpenCL extension cl_nv_copy_opts

I have tried to get some info about OpenCL extensions supported by my Nvidia card. I was able to get it for most of them by simply entering extension name in Google. One exception was cl_nv_copy_opts, for it Google returned pages from forums and benchmarks sites where people posted details about their cards, but no page with description of this extension. Do you have any information about this extension?

It indicated that a certain OpenCL 1.2 flag was available even in their OpenCL 1.1 driver; now that they fully support OpenCL 1.2 it is no longer needed (perhaps it is still listed for backwards compatibility).