diff --git a/README.md b/README.md
index eecc98c..1628225 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,11 @@ This command exec the installation flow of composer's install. This process requ
 ```
 This command exec `composer install`
 
+```vim
+:ComposerJSON
+```
+This command open `composer.json`
+
 ## Install
 ```vim
 Bundle 'vim-php/vim-composer'
diff --git a/plugin/vim-composer.vim b/plugin/vim-composer.vim
index b41a151..4985648 100644
--- a/plugin/vim-composer.vim
+++ b/plugin/vim-composer.vim
@@ -24,6 +24,7 @@ endif
 command! -narg=* ComposerRun call s:ComposerRunFunc(<q-args>)
 command! -narg=* ComposerInstall call s:ComposerRunFunc("install ".<q-args>)
 command! ComposerGet call s:ComposerGetFunc()
+command! ComposerJSON call s:OpenComposerJSON()
 
 function! s:ComposerRunFunc(arg)
     let s:arg = a:arg
@@ -33,3 +34,11 @@ endfunction
 function! s:ComposerGetFunc()
     exe "! curl -Ss https://getcomposer.org/installer | php"
 endfunction
+
+function! s:OpenComposerJSON()
+    if filereadable("./composer.json")
+        exe "vsplit ./composer.json"
+    else
+        echo "Composer json doesn't exist"
+    endif
+endfunction