diff --git a/README.mkd b/README.mkd
index 5c385cd..5d18bb0 100644
--- a/README.mkd
+++ b/README.mkd
@@ -142,6 +142,10 @@ If you want your gist to be private by default:
 
     let g:gist_post_private = 1
 
+If you want your gist to be anonymous by default:
+
+    let g:gist_post_anonymous = 1
+
 If you want to manipulate multiple files in a gist:
 
     let g:gist_get_multiplefile = 1
@@ -240,3 +244,5 @@ list of ["Authorized applications" on GitHub's "Account Settings"
 page][uas].
 
 [uas]: https://github.com/settings/applications
+
+**Note:** the username is optional if you only send anonymous gists.
diff --git a/autoload/gist.vim b/autoload/gist.vim
index eb2203f..299dcfe 100644
--- a/autoload/gist.vim
+++ b/autoload/gist.vim
@@ -660,10 +660,6 @@ endfunction
 
 function! gist#Gist(count, line1, line2, ...) abort
   redraw
-  if strlen(g:github_user) == 0
-    echohl ErrorMsg | echomsg "You don't have github account. read ':help gist-vim-setup'." | echohl None
-    return
-  endif
   let bufname = bufname("%")
   " find GistID: in content , then we should just update
   let gistid = ''
@@ -675,10 +671,14 @@ function! gist#Gist(count, line1, line2, ...) abort
   let clipboard = 0
   let deletepost = 0
   let editpost = 0
-  let anonymous = 0
+  let anonymous = get(g:, 'gist_post_anonymous', 0)
   let openbrowser = 0
   let listmx = '^\%(-l\|--list\)\s*\([^\s]\+\)\?$'
   let bufnamemx = '^' . s:bufprefix .'\(\zs[0-9a-f]\+\ze\|\zs[0-9a-f]\+\ze[/\\].*\)$'
+  if strlen(g:github_user) == 0 && anonymous == 0
+    echohl ErrorMsg | echomsg "You don't have github account. read ':help gist-vim-setup'." | echohl None
+    return
+  endif
   if bufname =~ bufnamemx
     let gistidbuf = matchstr(bufname, bufnamemx)
   elseif exists('b:gist') && has_key(b:gist, 'id')
diff --git a/doc/gist-vim.txt b/doc/gist-vim.txt
index a02f0d9..9b1504e 100644
--- a/doc/gist-vim.txt
+++ b/doc/gist-vim.txt
@@ -150,7 +150,10 @@ If you want to show your private gists with ":Gist -l": >
 If you want your gist to be private by default: >
 
     let g:gist_post_private = 1
+<
+If you want your gist to be anonymous by default: >
 
+    let g:gist_post_anonymous = 1
 <
 If you want to edit all files for gists containing more than one: >
 
@@ -270,6 +273,8 @@ Then, add following into your ~/.vimrc
 <
 This is not secure at all, so strongly discouraged.
 
+NOTE: the username is optional if you only send anonymous gists.
+
 ==============================================================================
 FAQ                                                           *gist-vim-faq*