fix NVCC not mentioned in environment variable list
@@ -51,6 +51,12 @@ Here are the environment variables CuPy uses.
| | its priority. Default is empty string (all |
| | accelerators are disabled). |
+------------------------------------+----------------------------------------------------+
+| ``NVCC`` | Define the compiler to use when compiling CUDA |
+| | source. Note that most CuPy kernels are built with |
+| | NVRTC; this environment is only effective for |
+| | RawKernels/RawModules with ``nvcc`` backend or |
+| | when using ``cub`` as the accelerator. |
++------------------------------------+----------------------------------------------------+
Moreover, as in any CUDA programs, all of the CUDA environment variables listed in the `CUDA Toolkit
Documentation`_ will also be honored.
