diff --git a/readme.md b/readme.md
index 79e45a1..7b65c7e 100644
--- a/readme.md
+++ b/readme.md
@@ -130,3 +130,9 @@ let g:vue_pre_processors = []
 ```
 
 Available pre-processors are: coffee, haml, handlebars, less, pug, sass, scss, slm, stylus, typescript
+
+When `g:vue_pre_processors` is set to 'detect_on_enter' instead of a list, vim-vue will detect the pre-processors used when a file is opened, and load only their syntax files.
+
+```vim
+let g:vue_pre_processors = 'detect_on_enter'
+```
diff --git a/syntax/vue.vim b/syntax/vue.vim
index 5403f3f..e93946a 100644
--- a/syntax/vue.vim
+++ b/syntax/vue.vim
@@ -31,7 +31,7 @@ function! s:should_register(language, start_pattern)
   if exists('g:vue_pre_processors')
     if type(g:vue_pre_processors) == v:t_list
       return index(g:vue_pre_processors, s:language.name) != -1
-    elseif g:vue_pre_processors is# 'auto'
+    elseif g:vue_pre_processors is# 'detect_on_enter'
       return search(a:start_pattern, 'n') != 0
     endif
   endif