diff --git a/README.md b/README.md
index 1595507..4aaad69 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,16 @@ You can also enter `:Fittenlogout` to log out.
 
 您还可以输入`:Fittenlogout`登出。
 
+You can customize the following global variables in your vimrc:
+
+- `g:fitten_updatetime`: set `updatetime` for auto completion trigger (default: `400`).
+- `g:fitten_auto_completion`: enable/disable auto completion (default: `1`).
+
+您可以在 vimrc 中自定义以下全局变量：
+
+- `g:fitten_updatetime`: 设置自动补全触发的 `updatetime`（默认值：`400`）。
+- `g:fitten_auto_completion`: 开启/关闭自动补全（默认值：`1`）。
+
 For more advanced usage, esp. using your own trigger functions, see `:help fitten-advanced`.
 
 有关更高级的用法，特别是使用您自己的触发器函数，请参阅`:help fitten advanced`。
diff --git a/plugin/fittencode.vim b/plugin/fittencode.vim
index df6aa76..8d19ff7 100644
--- a/plugin/fittencode.vim
+++ b/plugin/fittencode.vim
@@ -22,7 +22,9 @@ function! SetSuggestionStyle() abort
     endif
 endfunction
 
-let g:fitten_auto_completion = 0
+if !exists('g:fitten_auto_completion')
+    let g:fitten_auto_completion = 1
+endif
 
 function! Fittenlogin(account, password)
     let l:login_url = 'https://fc.fittenlab.cn/codeuser/login'
@@ -263,14 +265,8 @@ function! CodeAutoCompletion()
         let g:accept_just_now = g:accept_just_now - 1
         return ""
     endif
-    if col('.') == col('$')
-        call CodeCompletion()
-        return ""
-    endif
-    if empty(substitute(getline('.')[col('.') - 1:], '\s', '', 'g'))
-        call CodeCompletion()
-        return ""
-    endif
+    call CodeCompletion()
+    return ""
 endfunction
 
 function! FittenAcceptMain()
@@ -335,6 +331,10 @@ endif
 if !exists('g:fitten_login_status')
     let g:fitten_login_status = CheckLoginStatus()
 endif
+if !exists('g:fitten_updatetime')
+    let g:fitten_updatetime = 400
+endif
+execute 'set updatetime=' . g:fitten_updatetime
 function! FittenMapping()
     execute "inoremap" keytrans(g:fitten_trigger) '<Cmd>call CodeCompletion()<CR>'
     if g:fitten_accept_key isnot v:none
@@ -354,7 +354,6 @@ augroup fittencode
     autocmd ColorScheme,VimEnter * call SetSuggestionStyle()
     " Map tab using vim enter so it occurs after all other sourcing.
     autocmd VimEnter             * call FittenMapping()
-    set updatetime=1500
     autocmd CursorHoldI  * if g:fitten_auto_completion == 1 | call CodeAutoCompletion() | endif
     autocmd TextChangedI * call s:UpdateVirtualTextOnInput()
 augroup END