diff --git a/lib/ace/ext/modelist.js b/lib/ace/ext/modelist.js
index fba3a245..0351567b 100644
--- a/lib/ace/ext/modelist.js
+++ b/lib/ace/ext/modelist.js
@@ -47,7 +47,7 @@ var supportedModes = {
     ActionScript:["as"],
     ADA:         ["ada|adb"],
     Apache_Conf: ["^htaccess|^htgroups|^htpasswd|^conf|htaccess|htgroups|htpasswd"],
-    AsciiDoc:    ["asciidoc"],
+    AsciiDoc:    ["asciidoc|adoc"],
     Assembly_x86:["asm"],
     AutoHotKey:  ["ahk"],
     BatchFile:   ["bat|cmd"],