diff --git a/doc/vimwiki.txt b/doc/vimwiki.txt
index 493284c..b8c15e5 100644
--- a/doc/vimwiki.txt
+++ b/doc/vimwiki.txt
@@ -2321,6 +2321,8 @@ Value           Description~
 'expr'          Folding based on expression (folds sections and code blocks)
 'syntax'        Folding based on syntax (folds sections; slower than 'expr')
 'list'          Folding based on expression (folds list subitems; much slower)
+'custom'        Leave the folding settings as they are (e.g. set by another
+                plugin)
 
 Default: ''
 
diff --git a/plugin/vimwiki.vim b/plugin/vimwiki.vim
index ddb4b35..bcbf4de 100644
--- a/plugin/vimwiki.vim
+++ b/plugin/vimwiki.vim
@@ -167,6 +167,8 @@ function! s:setup_buffer_enter() "{{{
   elseif g:vimwiki_folding ==? 'syntax'
     setlocal fdm=syntax
     setlocal foldtext=VimwikiFoldText()
+  elseif g:vimwiki_folding ==? 'custom'
+    " do nothing
   else
     setlocal fdm=manual
     normal! zE