diff --git a/README.md b/README.md
index 753f524..6353cbe 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,9 @@
 [![CI](https://github.com/phanen/mder.nvim/actions/workflows/ci.yml/badge.svg)](https://github.com/phanen/mder.nvim/actions/workflows/ci.yml)
-# mder.nvim
 
+# mder.nvim
 ## Install
-```lua
-{ "phanen/mder.nvim", ft = "markdown", config = true },
-```
+> BREAKING CHANGES: this lib provide api only now
 
-## Config
-see `config.lua`
 ```lua
-local default_opts = {
-  ft = { "markdown", "typst" },
-  line = "<c- >",
-  codeblock = "<c-e>",
-  listdn = "o",
-  listup = "O",
-  img_link = "<leader>zi",
-  raw_link = "<leader>zj",
-}
+{ "phanen/mder.nvim", ft = "markdown" }
 ```
-
-## API
-see `commands.lua`
diff --git a/lua/mder/codeblock.lua b/lua/mder/codeblock.lua
index be7e905..dda7cc4 100644
--- a/lua/mder/codeblock.lua
+++ b/lua/mder/codeblock.lua
@@ -1,5 +1,7 @@
 -- surround codeblock with correct indent
-local wrap_codeblock = function()
+local M = {}
+
+M.surround = function()
   local vs, ve = vim.fn.getpos(".")[2], vim.fn.getpos("v")[2]
   if vs > ve then
     vs, ve = ve, vs
@@ -15,6 +17,4 @@ local wrap_codeblock = function()
   vim.api.nvim_feedkeys("A", "n", false)
 end
 
-return {
-  wrap_codeblock = wrap_codeblock,
-}
+return M
diff --git a/lua/mder/commands.lua b/lua/mder/commands.lua
deleted file mode 100644
index 58003a0..0000000
--- a/lua/mder/commands.lua
+++ /dev/null
@@ -1,8 +0,0 @@
-return {
-  codeblock = function() return require("mder.codeblock").wrap_codeblock() end,
-  line = function() return require("mder.line").toggle_lines() end,
-  listdn = function() return require("mder.autolist").listdn() end,
-  listup = function() return require("mder.autolist").listup() end,
-  img_link = function() return require("mder.link").wrap_or_paste_img() end,
-  raw_link = function() return require("mder.link").wrap_or_paste_raw() end,
-}
diff --git a/lua/mder/config.lua b/lua/mder/config.lua
deleted file mode 100644
index d40cfe7..0000000
--- a/lua/mder/config.lua
+++ /dev/null
@@ -1,34 +0,0 @@
-local M = {}
-
-local default_opts = {
-  ft = { "markdown", "typst" },
-  keymap = {
-    line = "<c- >",
-    codeblock = "<c-e>",
-    listdn = "o",
-    listup = "O",
-    img_link = "<leader>zi",
-    raw_link = "<leader>zj",
-  },
-}
-
-M.check_box = "%[x%]"
-M.empty_box = "%[ %]"
-
-M.setup = function(opts)
-  opts = vim.tbl_deep_extend("force", default_opts, opts or {})
-  vim.api.nvim_create_autocmd("Filetype", {
-    pattern = opts.ft,
-    callback = function()
-      local map = function(mode, act) vim.keymap.set(mode, opts.keymap[act], require("mder")[act], { buffer = 0 }) end
-      map({ "n", "x" }, "line")
-      map({ "x" }, "codeblock")
-      map({ "n" }, "listdn")
-      map({ "n" }, "listup")
-      map({ "n", "x" }, "img_link")
-      map({ "n", "x" }, "raw_link")
-    end,
-  })
-end
-
-return M
diff --git a/lua/mder/init.lua b/lua/mder/init.lua
deleted file mode 100644
index 32b2ff3..0000000
--- a/lua/mder/init.lua
+++ /dev/null
@@ -1,7 +0,0 @@
-local M = {}
-
-M.setup = function(opts) require("mder.config").setup(opts) end
-
-return setmetatable(M, {
-  __index = function(_, k) return require("mder.commands")[k] end,
-})
diff --git a/lua/mder/utils.lua b/lua/mder/utils.lua
index 932632b..848c061 100644
--- a/lua/mder/utils.lua
+++ b/lua/mder/utils.lua
@@ -1,6 +1,8 @@
+local M = {}
+
 -- 0-index, exclusive, linewise
 -- also "correct" in normal mode
-local visual_region = function()
+M.visual_region = function()
   local vs, ve = vim.fn.line ".", vim.fn.line "v"
   if vs > ve then
     vs, ve = ve, vs
@@ -8,6 +10,4 @@ local visual_region = function()
   return vs - 1, ve
 end
 
-return {
-  visual_region = visual_region,
-}
+return M