diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index bba808b656..e3788be106 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -15909,7 +15909,7 @@ exec %%LOCALBASE%%/bin/java -jar %%DATADIR%%/foo.jar "$@"</programlisting>
 	    <para><makevar>FORBIDDEN</makevar> is used for ports that
 	      contain a security vulnerability or induce grave
 	      concern regarding the security of a FreeBSD system with
-	      a given port installed (e.g. a reputably insecure program
+	      a given port installed (e.g., a reputably insecure program
 	      or a program that provides easily exploitable services).
 	      Ports should be marked as <makevar>FORBIDDEN</makevar>
 	      as soon as a particular piece of software has a