diff --git a/en_US.ISO8859-1/books/handbook/book.sgml b/en_US.ISO8859-1/books/handbook/book.sgml
index faf616b9a9..fac5024f24 100644
--- a/en_US.ISO8859-1/books/handbook/book.sgml
+++ b/en_US.ISO8859-1/books/handbook/book.sgml
@@ -21,6 +21,8 @@
 %teams;
 <!ENTITY % mailing-lists PUBLIC "-//FreeBSD//ENTITIES DocBook Mailing List Entities//EN"> %mailing-lists;
 <!ENTITY % newsgroups PUBLIC "-//FreeBSD//ENTITIES DocBook Newsgroup Entities//EN"> %newsgroups;
+<!ENTITY % txtfiles SYSTEM "txtfiles.ent"> %txtfiles;
+
 <!ENTITY % not.published "INCLUDE">
 
 <!ENTITY % chap.introduction "IGNORE">