diff --git a/README.md b/README.md
index 9de30ce..6d599f8 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@
      set rtp+=~/.vim/bundle/vundle/
      call vundle#rc()
 
+     " format: Bundle (git_url)|([vendor/]name)[ as alternate_install_name][, tree-ish][, {options}] 
      " let Vundle manage Vundle
      " required! 
      Bundle 'gmarik/vundle'
@@ -32,14 +33,18 @@
      " original repos on github
      Bundle 'tpope/vim-fugitive'
      Bundle 'Lokaltog/vim-easymotion'
-     Bundle 'rstacruz/sparkup', {'rtp': 'vim/'}
-     Bundle 'tpope/vim-rails.git'
      " vim-scripts repos
      Bundle 'L9'
      Bundle 'FuzzyFinder'
      " non github repos
      Bundle 'git://git.wincent.com/command-t.git'
+     " alternate install name 
+     Bundle 'rstacruz/sparkup as sparky', {'rtp': 'vim/'}
+     " specific tree-ish, in this case commit hash
+     Bundle 'tpope/vim-rails.git', '257bed767d589e2fcda59732d79fc871365cb0ef'
      " ...
+     " option 'local': 1 tells Vundle not to install/update this bundle, but still register its resources. 
+     " Bundle 'some-local-bundle', {'local': 1}
 
      filetype plugin indent on     " required!
      "
@@ -131,7 +136,7 @@ see [wiki](/gmarik/vundle/wiki)
 * √ put vundle to bundles/ too(will fix vundle help)
 * √ tests
 * √ improve error handling
-* allow specify revision/version?
+* √ allow specify git tree-ish (commit/branch/tag)
 * handle dependencies
 * show description in search results
 * search by description as well
diff --git a/autoload/vundle.vim b/autoload/vundle.vim
index 1ac74e1..b763f4c 100644
--- a/autoload/vundle.vim
+++ b/autoload/vundle.vim
@@ -44,3 +44,7 @@ func! vundle#rc(...) abort
   let g:vundle_changelog = ['Updated Bundles:']
   call vundle#config#init()
 endf
+
+func! vundle#hasBundle(bundle_install_name)
+  return exists('g:bundles') && has_key(g:bundles, a:bundle_install_name)
+endf
diff --git a/autoload/vundle/config.vim b/autoload/vundle/config.vim
index 55c7d7d..e710a2d 100644
--- a/autoload/vundle/config.vim
+++ b/autoload/vundle/config.vim
@@ -1,20 +1,30 @@
+func! vundle#config#init()
+  if !exists('g:bundles') | let g:bundles = {} | endif
+  call s:rtp_rm_a()
+  let g:bundles = {}
+endf
+
 func! vundle#config#bundle(arg, ...)
-  let bundle = vundle#config#init_bundle(a:arg, a:000)
+  let opts = extend(s:parse_options(a:000), s:parse_name_spec(a:arg))
+  let bundle = vundle#config#init_bundle(opts.name,opts)
   call s:rtp_rm_a()
-  call add(g:bundles, bundle)
+  let g:bundles[opts.name] = bundle
   call s:rtp_add_a()
   return bundle
 endf
 
-func! vundle#config#init()
-  if !exists('g:bundles') | let g:bundles = [] | endif
-  call s:rtp_rm_a()
-  let g:bundles = []
+func! vundle#config#parse_name_spec(arg)
+  return s:parse_name_spec(a:arg)
 endf
 
 func! vundle#config#require(bundles) abort
-  for b in a:bundles
-    call s:rtp_add(b.rtpath)
+  if type(a:bundles) == type({})
+    let bundles = values(a:bundles)
+  else
+    let bundles = a:bundles
+  endif
+  for b in bundles
+    call s:rtp_add(b.rtpath())
     call s:rtp_add(g:bundle_dir)
     " TODO: it has to be relative rtpath, not bundle.name
     exec 'runtime! '.b.name.'/plugin/*.vim'
@@ -24,27 +34,38 @@ func! vundle#config#require(bundles) abort
 endf
 
 func! vundle#config#init_bundle(name, opts)
-  let opts = extend(s:parse_options(a:opts), s:parse_name(substitute(a:name,"['".'"]\+','','g')))
-  let b = extend(opts, copy(s:bundle))
-  let b.rtpath = s:rtpath(opts)
+  let b = extend(a:opts, copy(s:bundle))
+  let b.name = a:name
+  "make sure keys for these options exist
+  let b.name_spec = get(b, 'name_spec', a:name)
+  let b.uri = get(b, 'uri', '')
   return b
 endf
 
 func! s:parse_options(opts)
-  " TODO: improve this
-  if len(a:opts) != 1 | return {} | endif
+  if len(a:opts) < 1 | return {} | endif
 
   if type(a:opts[0]) == type({})
     return a:opts[0]
-  else
-    return {'rev': a:opts[0]}
   endif
+  let opts = {'tree-ish': a:opts[0]}
+  if len(a:opts) >= 2 && type(a:opts[1]) == type({})
+    let opts = extend(a:opts[1], opts)
+  endif
+  return opts
 endf
 
-func! s:parse_name(arg)
-  let arg = a:arg
+func! s:parse_name_spec(arg)
+  let arg = substitute(a:arg,"['".'"]\+','','g')
   let git_proto = exists('g:vundle_default_git_proto') ? g:vundle_default_git_proto : 'https'
 
+  let altname = ''
+  let name_spec = arg
+  if arg =~? ' as '
+    let altname = split(arg, ' as ')[-1]
+    let arg = split(arg, ' as ')[0]
+  endif
+
   if    arg =~? '^\s*\(gh\|github\):\S\+'
   \  || arg =~? '^[a-z0-9][a-z0-9-]*/[^/]\+$'
     let uri = git_proto.'://github.com/'.split(arg, ':')[-1]
@@ -61,23 +82,15 @@ func! s:parse_name(arg)
     let name = arg
     let uri  = git_proto.'://github.com/vim-scripts/'.name.'.git'
   endif
-  return {'name': name, 'uri': uri, 'name_spec': arg }
+  return {'name': empty(altname) ? name : altname, 'uri': uri, 'name_spec': name_spec }
 endf
 
 func! s:rtp_rm_a()
-  let paths = map(copy(g:bundles), 'v:val.rtpath')
-  let prepends = join(paths, ',')
-  let appends = join(paths, '/after,').'/after'
-  exec 'set rtp-='.fnameescape(prepends)
-  exec 'set rtp-='.fnameescape(appends)
+  call filter(values(g:bundles), 's:rtp_rm(v:val.rtpath())')
 endf
 
 func! s:rtp_add_a()
-  let paths = map(copy(g:bundles), 'v:val.rtpath')
-  let prepends = join(paths, ',')
-  let appends = join(paths, '/after,').'/after'
-  exec 'set rtp^='.fnameescape(prepends)
-  exec 'set rtp+='.fnameescape(appends)
+  call filter(reverse(values(g:bundles)), 's:rtp_add(v:val.rtpath())')
 endf
 
 func! s:rtp_rm(dir) abort
@@ -94,13 +107,12 @@ func! s:expand_path(path) abort
   return simplify(expand(a:path, 1))
 endf
 
-func! s:rtpath(opts)
-  return has_key(a:opts, 'rtp') ? s:expand_path(a:opts.path().'/'.a:opts.rtp) : a:opts.path()
-endf
-
 let s:bundle = {}
 
 func! s:bundle.path()
   return s:expand_path(g:bundle_dir.'/'.self.name)
 endf
 
+func! s:bundle.rtpath()
+  return has_key(self, 'rtp') ? s:expand_path(self.path().'/'.self.rtp) : self.path()
+endf
diff --git a/autoload/vundle/installer.vim b/autoload/vundle/installer.vim
index 38a2436..ee2d23a 100644
--- a/autoload/vundle/installer.vim
+++ b/autoload/vundle/installer.vim
@@ -3,7 +3,7 @@ func! vundle#installer#new(bang, ...) abort
         \ g:bundles :
         \ map(copy(a:000), 'vundle#config#bundle(v:val, {})')
 
-  let names = vundle#scripts#bundle_names(map(copy(bundles), 'v:val.name_spec'))
+  let names = vundle#scripts#bundle_names(map(values(bundles), 'v:val.name_spec'))
   call vundle#scripts#view('Installer',['" Installing bundles to '.expand(g:bundle_dir, 1)], names +  ['Helptags'])
 
   call s:process(a:bang, (a:bang ? 'add!' : 'add'))
@@ -39,7 +39,7 @@ func! s:process(bang, cmd)
     setl nomodified
   endfor
 
-  redraw
+   redraw
   echo 'Done! '.msg
 endf
 
@@ -89,18 +89,27 @@ func! s:sign(status)
   exe ":sign place ".line('.')." line=".line('.')." name=Vu_". a:status ." buffer=" . bufnr("%")
 endf
 
-func! vundle#installer#install_and_require(bang, name) abort
-  let result = vundle#installer#install(a:bang, a:name)
-  let b = vundle#config#bundle(a:name, {})
+func! vundle#installer#install_and_require(bang, name_spec) abort
+  let result = vundle#installer#install(a:bang, a:name_spec)
+  let opts = vundle#config#parse_name_spec(a:name_spec)
+  if    !has_key(g:bundles, opts.name) 
+  \  || g:bundles[opts.name].name_spec != opts.name_spec
+    let b = vundle#config#bundle(opts.name, opts)
+  endif
   call vundle#installer#helptags([b])
   call vundle#config#require([b])
   return result
 endf
 
-func! vundle#installer#install(bang, name) abort
+func! vundle#installer#install(bang, name_spec) abort
   if !isdirectory(g:bundle_dir) | call mkdir(g:bundle_dir, 'p') | endif
-
-  let b = vundle#config#init_bundle(a:name, {})
+  let opts = vundle#config#parse_name_spec(a:name_spec)
+  if    has_key(g:bundles, opts.name)
+  \  && g:bundles[opts.name].name_spec == opts.name_spec
+    let b = g:bundles[opts.name]
+  else
+    let b = vundle#config#init_bundle(opts.name, opts)
+  endif
 
   return s:sync(a:bang, b)
 endf
@@ -111,7 +120,7 @@ func! vundle#installer#docs() abort
 endf
 
 func! vundle#installer#helptags(bundles) abort
-  let bundle_dirs = map(copy(a:bundles),'v:val.rtpath')
+  let bundle_dirs = map(values(a:bundles),'v:val.rtpath()')
   let help_dirs = filter(bundle_dirs, 's:has_doc(v:val)')
 
   call s:log('')
@@ -133,7 +142,7 @@ endf
 
 
 func! vundle#installer#clean(bang) abort
-  let bundle_dirs = map(copy(g:bundles), 'v:val.path()') 
+  let bundle_dirs = map(values(g:bundles), 'v:val.path()') 
   let all_dirs = v:version >= 702 ? split(globpath(g:bundle_dir, '*', 1), "\n") : split(globpath(g:bundle_dir, '*'), "\n")
   let x_dirs = filter(all_dirs, '0 > index(bundle_dirs, v:val)')
 
@@ -158,6 +167,7 @@ func! vundle#installer#clean(bang) abort
       call s:process(a:bang, 'D')
     endif
   endif
+  "TODO add checks to ensure bundle's remote origin is same as specified uri
 endf
 
 
@@ -203,23 +213,35 @@ func! s:helptags(rtp) abort
 endf
 
 func! s:sync(bang, bundle) abort
+  "bundle dev friendly:
+  "if bundle has local flag - skip it as it's files is not managed by vundle
+  if get(a:bundle, 'local', 0) == 1
+    return 'todate'
+  endif
   let git_dir = expand(a:bundle.path().'/.git/', 1)
+  let target_treeish = get(a:bundle, 'tree-ish', 'master')
+  let cd = 'cd '
+  if (has('win32') || has('win64'))
+    let cd = 'cd /d ' " add /d switch to change drives
+  endif
   if isdirectory(git_dir)
     if !(a:bang) | return 'todate' | endif
-    let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull'
-
-    if (has('win32') || has('win64'))
-      let cmd = substitute(cmd, '^cd ','cd /d ','')  " add /d switch to change drives
-      let cmd = '"'.cmd.'"'                          " enclose in quotes
-    endif
+    let cmd = cd . shellescape(a:bundle.path()).' && git checkout master && git pull --ff-only --all && git checkout '.shellescape(target_treeish)
 
-    let get_current_sha = 'cd '.shellescape(a:bundle.path()).' && git rev-parse HEAD'
+    let get_current_sha = cd . shellescape(a:bundle.path()).' && git rev-parse HEAD'
     let initial_sha = s:system(get_current_sha)[0:15]
+    "make sure non-hash will not be accidentally matched
+    if (len(target_treeish) > 5 && stridx(initial_sha, target_treeish) == 0) | return 'todate' | endif
   else
     let cmd = 'git clone '.a:bundle.uri.' '.shellescape(a:bundle.path())
+    let cmd .= ' && '. cd . shellescape(a:bundle.path()).' && git checkout '.shellescape(target_treeish) 
     let initial_sha = ''
   endif
 
+  if (has('win32') || has('win64'))
+    let cmd = '"'.cmd.'"'   " enclose in quotesi
+  endif
+
   let out = s:system(cmd)
   call s:log('')
   call s:log('Bundle '.a:bundle.name_spec)