diff --git a/app/models/project_wiki.rb b/app/models/project_wiki.rb
index a8ba5efcc7c19206ecb89c8bba24623cf1e6b4cc..a82a300a672d3cf3892904ddc50f0c817f0f7f43 100644
--- a/app/models/project_wiki.rb
+++ b/app/models/project_wiki.rb
@@ -2,8 +2,9 @@ class ProjectWiki
   include Gitlab::ShellAdapter
 
   MARKUPS = {
-    "Markdown" => :markdown,
-    "RDoc"     => :rdoc
+    'Markdown' => :markdown,
+    'RDoc'     => :rdoc,
+    'AsciiDoc' => :asciidoc
   }
 
   class CouldNotCreateWikiError < StandardError; end