diff --git a/doc/en/racc.en.rhtml b/doc/en/racc.en.rhtml
index 0a652847..cb266e9a 100644
--- a/doc/en/racc.en.rhtml
+++ b/doc/en/racc.en.rhtml
@@ -8,7 +8,7 @@ $Id$
 <table summary="package descriptor">
 <tr><th>Version</th><td><%= version %></td></tr>
 <tr><th>Type</th><td>Parser Generator</td></tr>
-<tr><th>Format</th><td>Ruby script + Ruby extention</td></tr>
+<tr><th>Format</th><td>Ruby script + Ruby extension</td></tr>
 <tr><th>Requirement</th><td>ruby (&gt;=1.6)</td></tr>
 <tr><th>License</th><td>LGPL</td></tr>
 </table>