diff --git a/autoload/pathogen.vim b/autoload/pathogen.vim
index 579141d..fe7b053 100644
--- a/autoload/pathogen.vim
+++ b/autoload/pathogen.vim
@@ -105,4 +105,13 @@ endfunction
 let s:done_bundles = ''
 " }}}1
 
+" Invoke :helptags on all non-$VIM doc directories in runtimepath.
+function! pathogen#helptags() " {{{1
+  for dir in pathogen#split(&rtp)
+    if dir[0 : strlen($VIM)-1] !=# $VIM && isdirectory(dir.'/doc') && (!filereadable(dir.'/doc/tags') || filewritable(dir.'/doc/tags'))
+      helptags `=dir.'/doc'`
+    endif
+  endfor
+endfunction " }}}1
+
 " vim:set ft=vim ts=8 sw=2 sts=2: