diff --git a/en_US.ISO8859-1/books/handbook/chapter.decl b/en_US.ISO8859-1/books/handbook/chapter.decl
index ce0a7ed16a..ecb0cac2f9 100644
--- a/en_US.ISO8859-1/books/handbook/chapter.decl
+++ b/en_US.ISO8859-1/books/handbook/chapter.decl
@@ -1 +1 @@
-<!DOCTYPE chapter PUBLIC "-//FreeBSD//DTD DocBook V3.1-Based Extension//EN">
+<!DOCTYPE chapter PUBLIC "-//FreeBSD//DTD DocBook V4.1-Based Extension//EN">