diff --git a/public/help/wiki_syntax_detailed.html b/public/help/wiki_syntax_detailed.html
index a1af336..23ea8b7 100644
--- a/public/help/wiki_syntax_detailed.html
+++ b/public/help/wiki_syntax_detailed.html
@@ -200,7 +200,7 @@ p>. right aligned
 p=. centered
 </pre>
 
-        <p style="text-align:center;">This is centered paragraph.</p>
+        <p style="text-align:center;">This is a centered paragraph.</p>
 
 
         <h3><a name="10" class="wiki-page"></a>Blockquotes</h3>