Advertise --float16 option

README.md

@@ -45,7 +45,7 @@ To process multiple files, specify multiple input files or directories, and give
 ```bash
 beat_this path/to/*.mp3 path/to/whole_directory/ -o path/to/output_directory
 ```
-The beat tracker will use the first GPU in your system by default, and fall back to CPU if PyTorch does not have CUDA access. With `--gpu=2`, it will use the third GPU, and with `--gpu=-1` it will force the CPU.
+The beat tracker will use the first GPU in your system by default, and fall back to CPU if PyTorch does not have CUDA access. With `--gpu=2`, it will use the third GPU, and with `--gpu=-1` it will force the CPU. For recent GPUs, passing `--float16` may improve speed.
 If you have a lot of files to process, you can distribute the load over multiple processes by running the same command multiple times with `--touch-first`, `--skip-existing` and potentially different options for `--gpu`:
 ```bash
 for gpu in {0..3}; do beat_this input_dir -o output_dir --touch-first --skip-existing --gpu=$gpu & done