diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index eac9eb5016..2abeea9d7e 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -1,4 +1,4 @@
-!--
+<!--
      The FreeBSD Documentation Project
 
      $FreeBSD$