diff --git a/.gitmodules b/.gitmodules
index 48a19bd..1152d25 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "gtkdoc"]
 	path = gtkdoc
-	url = git://github.com/eiiches/gtkdoc.git
+	url = git://github.com/albfan/gtkdoc.git
diff --git a/README b/README
deleted file mode 100644
index 41948e1..0000000
--- a/README
+++ /dev/null
@@ -1,15 +0,0 @@
-vim-ref addon for gtkdoc (or devhelp?)
-======================================
-
-Requirements:
-	devhelpforcui [http://github.com/eiiches/devhelpforcui]
-	vim-ref [http://github.com/thinca/vim-ref]
-
-Installation:
-	1. install files under 'runtimepath' directory.
-	2. set g:ref_gtkdoc_cmd to devhelpforcui's show command.
-		Ex) let g:ref_gtkdoc_cmd='/path/to/devhelp/for/cui/command/show'
-
-Usage:
-	:Ref gtkdoc <keyword>
-	
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..df361b4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,27 @@
+# vim-ref addon for gtkdoc (or devhelp)
+
+See gtk documentation on vim
+
+## Screencast
+
+![screencast of vim-ref-gtkdoc](etc/GtkHelp_vim.gif)
+
+## Install with Vundle:
+
+    Plugin 'thinca/vim-ref'
+    Plugin 'eiiches/gtkdoc'
+
+    cd path/to/plugin
+    # usually ~/.vim/bundle/vim-ref-gtkdoc)
+    make
+
+## Usage:
+
+    :Ref gtkdoc <keyword>
+    :GtkHelp (word under cursor or visual selection)
+
+## Credits
+
+	- gtkdoc-cui [http://github.com/eiiches/gtkdoc]
+	- vim-ref [http://github.com/thinca/vim-ref]
+
diff --git a/autoload/ref/gtkdoc.vim b/autoload/ref/gtkdoc.vim
index 0a3886e..abf3735 100644
--- a/autoload/ref/gtkdoc.vim
+++ b/autoload/ref/gtkdoc.vim
@@ -50,5 +50,21 @@ function! ref#gtkdoc#define()  " {{{2
   return s:source
 endfunction
 
+function! ref#gtkdoc#vsel(type)  " {{{2
+  if "vV" =~ mode()
+    let [lnum1, col1] = getpos("'<")[1:2]
+    let [lnum2, col2] = getpos("'>")[1:2]
+    let lines = getline(lnum1, lnum2)
+    let lines[-1] = lines[-1][: col2 - (&selection == 'inclusive' ? 1 : 2)]
+    let lines[0] = lines[0][col1 - 1:]
+    let patter = join(lines)
+  else
+    let pattern = expand("<cword>")
+  endif
+
+  call ref#ref(a:type . ' ' . pattern)
+
+endfunction
+
 let &cpo = s:save_cpo
 unlet s:save_cpo
diff --git a/autoload/ref/gtkdocfull.vim b/autoload/ref/gtkdocfull.vim
new file mode 100644
index 0000000..ec88a46
--- /dev/null
+++ b/autoload/ref/gtkdocfull.vim
@@ -0,0 +1,53 @@
+" A ref source for gtkdocfull.
+" Version: 0.0.1
+" Author : albfan <albertofanjul@gmail.com>
+" License: Creative Commons Attribution 2.1 Japan License
+"          <http://creativecommons.org/licenses/by/2.1/jp/deed.en>
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if !exists('g:ref_gtkdoc_cmd_full')
+	let g:ref_gtkdoc_cmd_full = globpath(&rtp, 'gtkdoc/gtkdocfull', 1)
+endif
+
+let s:source = {'name': 'gtkdocfull'}  " {{{1
+
+function! s:source.available()  " {{{2
+  return !empty(g:ref_gtkdoc_cmd_full)
+endfunction
+
+function! s:source.get_body(query)  " {{{2
+  return ref#system(g:ref_gtkdoc_cmd_full.' '.a:query).stdout
+endfunction
+
+function! s:source.opened(query)  " {{{2
+  execute "normal! gg"
+  call s:syntax(a:query)
+endfunction
+
+function! s:source.normalize(query)  " {{{2
+  return substitute(substitute(a:query, '\_s\+', ' ', 'g'), '^ \| $', '', 'g')
+endfunction
+
+" misc. {{{1
+function! s:syntax(query)  " {{{2
+  if exists('b:current_syntax') && b:current_syntax == 'ref-gtkdocfull'
+    return
+  endif
+
+  syntax clear
+  let str = escape(substitute(a:query, '\s\+', '\\_s\\+', 'g'), '"')
+  if str =~# '^[[:alnum:]_[:space:]]\+$'
+    let str = '\<' . str . '\>'
+		execute 'syntax match refGtkDocFullKeyword "\c'.str.'"'
+		highlight default link refGtkDocFullKeyword Special
+  endif
+endfunction
+
+function! ref#gtkdocfull#define()  " {{{2
+  return s:source
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
diff --git a/etc/GtkHelp_vim.gif b/etc/GtkHelp_vim.gif
new file mode 100644
index 0000000..ece3c7b
Binary files /dev/null and b/etc/GtkHelp_vim.gif differ
diff --git a/gtkdoc b/gtkdoc
index 173f9fb..5fd543a 160000
--- a/gtkdoc
+++ b/gtkdoc
@@ -1 +1 @@
-Subproject commit 173f9fb15f7378827679bd050ab00d6797fb1b73
+Subproject commit 5fd543a7e92c7544e61fcd02eef1f0c258c230ce
diff --git a/plugin/gtkdoc.vim b/plugin/gtkdoc.vim
new file mode 100644
index 0000000..23abed8
--- /dev/null
+++ b/plugin/gtkdoc.vim
@@ -0,0 +1,2 @@
+command! -range GtkHelp call ref#gtkdoc#vsel('gtkdoc')
+command! -range GtkHelpFull call ref#gtkdoc#vsel('gtkdocfull')