diff --git a/README.markdown b/README.markdown
index a72894a..34b9ef1 100644
--- a/README.markdown
+++ b/README.markdown
@@ -102,10 +102,10 @@ Note: Now start vim with plain `vim`, not `vim .`
 
 
 ---
-> How can I open NERDTree as a tab window automatically when vim opens a directory?
+> How can I open NERDTree as a tab window automatically when vim starts up on opening a directory?
 
     autocmd StdinReadPre * let s:std_in=1
-    autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | NERDTree | wincmd p | ene | endif
+    autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | endif
 
 This trick also prevents NERDTree from hiding when first select a file.