diff --git a/.gitignore b/.gitignore
index ef5a10d..9d557fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
 /lazy-lock.json
-/_full_feature
+/custom.lua
diff --git a/README.md b/README.md
index 9146be5..26acac8 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,11 @@ git clone <url of this repo> ~/.config/nvim
 
 By default, this config will only include a few plugins, which suit for mataining other than editing frequently.
 
-If you want to use the full feature this config provided, create a file named `_full_feature` under the root of this repo (usually `~/.config/nvim`.
+A custom config (`custom.lua`) file placed aside with `init.lua` is optional, it's content like below.
 
 ```
-touch ~/.config/nvim/_full_feature
+return {
+    full_feature = true,                    # enable all configured plugins
+    proxy_url = "http://localhost:8888",    # setup proxy for some plugins (like treesitter)
+}
 ```
diff --git a/init.lua b/init.lua
index 3b72e45..93b75e4 100644
--- a/init.lua
+++ b/init.lua
@@ -26,11 +26,19 @@ vim.keymap.set("n", "<F2>", "<cmd>bnext<CR>",     { silent = true })
 vim.g.mapleader = " "
 vim.g.maplocalleader = " "
 
-function file_exists(name)
-   local f=io.open(name,"r")
-   if f~=nil then io.close(f) return true else return false end
+-- Load custom config
+custom = {
+    full_feature = false,
+    proxy_url = "",
+}
+
+local custom_config_path = vim.fn.stdpath("config") .. "/custom.lua"
+local ok, t = pcall(dofile, custom_config_path)
+if ok then
+    for k, v in pairs(t) do
+        custom[k] = v
+    end
 end
-full_feature = file_exists(vim.fn.stdpath("config") .. "/_full_feature")
 
 -- Use lazy.nvim as plugin manager, and load plugin's config
 local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
diff --git a/lua/plugins/10-editor.lua b/lua/plugins/10-editor.lua
index 52d78a5..5bbf49c 100644
--- a/lua/plugins/10-editor.lua
+++ b/lua/plugins/10-editor.lua
@@ -24,13 +24,13 @@ return {
     },
     {
         "karb94/neoscroll.nvim",
-        enabled = full_feature,
+        enabled = custom.full_feature,
         main = "neoscroll",
         opts = { },
     },
     {
         "akinsho/bufferline.nvim",
-        enabled = full_feature,
+        enabled = custom.full_feature,
         main = "bufferline",
         opts = {
             options = {
@@ -54,7 +54,7 @@ return {
     },
     {
         "nvim-lualine/lualine.nvim",
-        enabled = full_feature,
+        enabled = custom.full_feature,
         dependencies = {
             "nvim-tree/nvim-web-devicons"
         },
@@ -66,7 +66,7 @@ return {
     },
     {
         "nvim-tree/nvim-tree.lua",
-        enabled = full_feature,
+        enabled = custom.full_feature,
         dependencies = {
             "nvim-tree/nvim-web-devicons"
         },
diff --git a/lua/plugins/20-git.lua b/lua/plugins/20-git.lua
index a41628d..28e0b55 100644
--- a/lua/plugins/20-git.lua
+++ b/lua/plugins/20-git.lua
@@ -1,7 +1,7 @@
 return {
     "lewis6991/gitsigns.nvim",
     main = "gitsigns",
-    enabled = full_feature,
+    enabled = custom.full_feature,
     opts = {
         on_attach = function(bufnr)
             local gs = package.loaded.gitsigns
diff --git a/lua/plugins/20-treesitter.lua b/lua/plugins/20-treesitter.lua
index cb86db3..e2354d7 100644
--- a/lua/plugins/20-treesitter.lua
+++ b/lua/plugins/20-treesitter.lua
@@ -44,7 +44,7 @@ local basic_ensure = {
     "yaml",
 }
 
-if full_feature then
+if custom.full_feature then
     ensure = full_ensure
 else
     ensure = basic_ensure
@@ -63,6 +63,10 @@ return {
     },
     config = function (this, opts)
         require(this.name .. ".configs").setup(opts);
-        require(this.name .. ".install").prefer_git = true;
+        if custom.proxy_url ~= "" then
+            require(this.name .. ".install").command_extra_args = {
+                curl = { "--proxy", custom.proxy_url }
+            }
+        end
     end
 }
diff --git a/lua/plugins/50-lsp.lua b/lua/plugins/50-lsp.lua
index 098efa9..649f4f3 100644
--- a/lua/plugins/50-lsp.lua
+++ b/lua/plugins/50-lsp.lua
@@ -39,7 +39,7 @@ end
 return {
     {
         "neovim/nvim-lspconfig",
-        enabled = full_feature,
+        enabled = custom.full_feature,
         dependencies = {
             "hrsh7th/nvim-cmp",
             "hrsh7th/cmp-nvim-lsp",