C++ for OpenCL is a community-based, open-source C++ kernel language for OpenCL that combines full OpenCL C with most features of C++17, implemented in Clang and LLVM. Using the new ‘year of release’ versioning scheme, the draft documentation for C++ for OpenCL 2021 language is now released on GitHub for developer review and feedback. C++ for OpenCL 2021 is fully compatible with OpenCL 3.0 as the same features are made optional in both.