diff --git a/.vimrc.local b/.vimrc.local
index bca2f4e..02e101d 100644
--- a/.vimrc.local
+++ b/.vimrc.local
@@ -6,3 +6,6 @@
 
 " for test
 " let g:rainbow_active = 1
+
+" vim read mode
+" autocmd BufRead * let &l:modifiable = !&readonly