(Neo)Vim syntax highlight for byeol language How to install first checks the vim's runtime path. if you're using 'lua neovim', then you can try it easily by typing :lua print(vim.inspect(vim.api.nvim_list_runtime_paths())) in your vim. it's usally located at ~/.config/nvim/, but can be different by OS or kind of 32bit things. and then download latest release binary and unzip in your runtimepath folder. there should be <yourRuntimePath>/ftdetect, <yourRuntimePath>/syntax folders. after that, please quit your vim if it's running. you may need to check whether you've write set syntax=on on your .vimrc file.