diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
deleted file mode 100644
index 210a71c..0000000
--- a/.pre-commit-config.yaml
+++ /dev/null
@@ -1,6 +0,0 @@
----
-repos:
-  - repo: https://github.com/google/vimdoc
-    rev: 73bc1efaacb55a59d5206d0ac50e5432ea0192c1
-    hooks:
-      - id: vimdoc
diff --git a/autoload/coc/source/requirements.vim b/autoload/coc/source/requirements.vim
deleted file mode 100644
index ea778d8..0000000
--- a/autoload/coc/source/requirements.vim
+++ /dev/null
@@ -1,20 +0,0 @@
-""
-" https://github.com/neoclide/coc.nvim/wiki/Create-custom-source
-function! coc#source#requirements#init() abort
-    return {
-                \ 'shortcut': 'pip',
-                \ 'priority': 9,
-                \ 'filetypes': ['requirements'],
-                \ }
-endfunction
-
-""
-" https://github.com/neoclide/coc.nvim/wiki/Create-custom-source
-"
-" Completion pip option and PYPI package names.
-" Note: completion PYPI package names need install pip-cache from PYPI,
-" and run `pip-cache update` first to generate cache.
-function! coc#source#requirements#complete(opt, cb) abort
-    call a:cb(g:requirements#items)
-endfunction
-" vim: et sw=4 ts=4 sts=4:
diff --git a/autoload/requirements.vim b/autoload/requirements.vim
deleted file mode 100644
index 326d0a0..0000000
--- a/autoload/requirements.vim
+++ /dev/null
@@ -1,44 +0,0 @@
-""
-" @section Introduction, intro
-" @library
-" <doc/@plugin(name).txt> is generated by <https://github.com/google/vimdoc>.
-" See <README.md> for more information about installation and screenshots.
-
-""
-" Update cache.
-function! requirements#update_cache() abort
-    let s:items = []
-    let l:pip_items = split(system('COMP_WORDS="pip install -" COMP_CWORD=2 PIP_AUTO_COMPLETE=1 pip'))
-    let l:pypi_items = split(system('pip-cache pkgnames'))
-    for l:item in l:pip_items
-        let s:items += [{'word': l:item, 'menu': 'pip'}]
-    endfor
-    for l:item in l:pypi_items
-        let s:items += [{'word': l:item, 'menu': 'pypi'}]
-    endfor
-    call writefile([json_encode(s:items)], s:cache)
-endfunction
-
-if exists('*stdpath')
-    let s:cache_dir_home = stdpath('cache')
-else
-    let s:cache_dir_home = $HOME . '/.cache/nvim'
-endif
-let s:cache_dir = s:cache_dir_home . '/requirements.vim'
-call mkdir(s:cache_dir, 'p')
-""
-" Completion cache path.
-call g:requirements#utils#plugin.Flag('g:requirements#cache',
-            \ s:cache_dir . '/requirements.json'
-            \ )
-let s:cache = g:requirements#cache
-try
-    let s:items = json_decode(readfile(s:cache)[0])
-catch /\v^Vim%(\(\a+\))?:E(684|484|491):/
-    call requirements#update_cache()
-    let s:items = json_decode(readfile(s:cache)[0])
-endtry
-""
-" Completion cache contents. For program.
-call g:requirements#utils#plugin.Flag('g:requirements#items', s:items)
-" vim: et sw=4 ts=4 sts=4:
diff --git a/doc/requirements.txt b/doc/requirements.txt
deleted file mode 100644
index 1f5bd39..0000000
--- a/doc/requirements.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-*requirements.txt*	the Requirements File Format syntax support for Vim
-raimon                                                          *requirements*
-
-==============================================================================
-CONTENTS                                               *requirements-contents*
-  1. Introduction.........................................|requirements-intro|
-  2. Configuration.......................................|requirements-config|
-  3. Functions........................................|requirements-functions|
-
-==============================================================================
-INTRODUCTION                                              *requirements-intro*
-
-<doc/requirements.txt> is generated by <https://github.com/google/vimdoc>. See
-<README.md> for more information about installation and screenshots.
-
-==============================================================================
-CONFIGURATION                                            *requirements-config*
-
-                                           *requirements:g:requirements#cache*
-Completion cache path.
-Default: s:cache_dir . '/requirements.json' `
-
-                                           *requirements:g:requirements#items*
-Completion cache contents. For program.
-Default: s:items `
-
-==============================================================================
-FUNCTIONS                                             *requirements-functions*
-
-coc#source#requirements#init()                *coc#source#requirements#init()*
-  https://github.com/neoclide/coc.nvim/wiki/Create-custom-source
-
-coc#source#requirements#complete({opt}, {cb})
-                                          *coc#source#requirements#complete()*
-  https://github.com/neoclide/coc.nvim/wiki/Create-custom-source
-
-  Completion pip option and PYPI package names. Note: completion PYPI package
-  names need install pip-cache from PYPI, and run `pip-cache update` first to
-  generate cache.
-
-requirements#update_cache()                      *requirements#update_cache()*
-  Update cache.
-
-
-vim:tw=78:ts=8:ft=help:norl: