diff --git a/doc/NERD_commenter.txt b/doc/NERD_commenter.txt
index 1a28edb..fc6a07c 100644
--- a/doc/NERD_commenter.txt
+++ b/doc/NERD_commenter.txt
@@ -812,6 +812,7 @@ if your face looked like a toaster and a t-rex put together? :(
     - add support for mako and genshi, thanks to Keitheis.
     - add support for conkyrc, thanks to David
     - add support for SVNannotate, thanks to Miguel Jaque Barbero.
+    - add support for sieve, thanks to Stefan Walk
 
 2.2.0
     - rewrote the mappings system to be more "standard".
@@ -1051,6 +1052,7 @@ Simon Ruderich                      asciidoc, git, gitcommit, gitrebase
 Keitheis                            mako, genshi
 David                               conkyrc
 Miguel Jaque Barbero                SVNannotate
+Stefan Walk                         sieve
 
 ==============================================================================
 9. License                                                    *NERDComLicense*
diff --git a/plugin/NERD_commenter.vim b/plugin/NERD_commenter.vim
index a311adc..41309e9 100644
--- a/plugin/NERD_commenter.vim
+++ b/plugin/NERD_commenter.vim
@@ -725,6 +725,8 @@ function s:SetUpForNewFiletype(filetype, forceReset)
         call s:MapDelimiters('<!--','-->')
     elseif a:filetype == "sicad"
         call s:MapDelimiters('*', '')
+    elseif a:filetype == "sieve"
+        call s:MapDelimiters('#', '')
     elseif a:filetype == "simula"
         call s:MapDelimitersWithAlternative('%', '', '--', '')
     elseif a:filetype == "sinda"