diff --git a/reference/xslt/book.xml b/reference/xslt/book.xml
index acc30bd028..4ec6c182f2 100644
--- a/reference/xslt/book.xml
+++ b/reference/xslt/book.xml
@@ -4,7 +4,7 @@
 <!-- Membership: bundled, external -->
  
 <book xml:id="book.xslt" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
- <title>XSLT (PHP4)</title>
+ <title>XSLT (PHP 4)</title>
  
  <!-- {{{ preface -->
  <preface xml:id="intro.xslt">