--- a/doc/ja/docbook.ja.conf
+++ b/doc/ja/docbook.ja.conf
@@ -481,7 +481,7 @@ template::[header-declarations]
 </book>
 
 [preamble]
-# Preamble is not allowed in DocBook book so wrap it in a preface. 
+# Preamble is not allowed in DocBook book so wrap it in a preface.
 <preface{id? id="{id}"}>
 <title>Preface</title>
 |