diff --git a/chapter06/config-ldso.xml b/chapter06/config-ldso.xml
index b1c6b8b43..de4a9641b 100644
--- a/chapter06/config-ldso.xml
+++ b/chapter06/config-ldso.xml
@@ -9,9 +9,10 @@ by programs when you run them. However, if there are libraries in
 directories other than <filename class="directory">/lib</filename> and
 <filename class="directory">/usr/lib</filename>, you need to add them to
 the <filename>/etc/ld.so.conf</filename> file in order for the dynamic
-loader to find them. One directory that is very common to contain
-additional libraries is <filename
-class="directory">/usr/local/lib</filename> so we add that directory to the
+loader to find them. Two directories that are commonly known to contain
+additional libraries are <filename
+class="directory">/usr/local/lib</filename> and <filename
+class="directory">/opt/lib</filename>, so we add those directories to the
 dynamic loader's search path.</para>
 
 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
@@ -21,6 +22,7 @@ following:</para>
 # Begin /etc/ld.so.conf
 
 /usr/local/lib
+/opt/lib
 
 # End /etc/ld.so.conf
 <userinput>EOF</userinput></screen></para>