diff --git a/public/help/wiki_syntax_detailed.html b/public/help/wiki_syntax_detailed.html
index 9fa3dd0ac..0398e4fa0 100644
--- a/public/help/wiki_syntax_detailed.html
+++ b/public/help/wiki_syntax_detailed.html
@@ -169,7 +169,7 @@ http://www.redmine.org, someone@foo.bar
     <h2><a name="5" class="wiki-page"></a>Text formatting</h2>
 
 
-    <p>For things such as headlines, bold, tables, lists, Redmine supports Textile syntax.  See <a class="external" href="http://www.textism.com/tools/textile/">http://www.textism.com/tools/textile/</a> for information on using any of these features.  A few samples are included below, but the engine is capable of much more of that.</p>
+    <p>For things such as headlines, bold, tables, lists, Redmine supports Textile syntax.  See <a class="external" href="http://en.wikipedia.org/wiki/Textile_%28markup_language%29">http://en.wikipedia.org/wiki/Textile_(markup_language)</a> for information on using any of these features.  A few samples are included below, but the engine is capable of much more of that.</p>
 
         <h3><a name="6" class="wiki-page"></a>Font style</h3>