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diff --git a/chapter08/expect.xml b/chapter08/expect.xml
index 6286d9033..7b6dac354 100644
--- a/chapter08/expect.xml
+++ b/chapter08/expect.xml
@@ -82,10 +82,27 @@
<screen><userinput remap="make">make</userinput></screen>
+ <important>
+ <para>The test suite for Expect is considered critical.
+ Do not skip it under any circumstances.</para>
+ </important>
+
<para>To test the results, issue:</para>
<screen><userinput remap="test">make test</userinput></screen>
+ <para>If any test fails with the message
+ <quote><computeroutput>The system has no more ptys. Ask your system
+ administrator to create more</computeroutput></quote>, it indicates
+ you've not mounted the
+ <systemitem class="filesystem">devpts</systemitem> file system
+ correctly. You need to exit from the chroot environment, read
+ <xref linkend='ch-tools-kernfs'/> again, and ensure the
+ <systemitem class="filesystem">devpts</systemitem> file system (and
+ other virtual kernel file systems) mounted correctly. Then reenter
+ the chroot environment following <xref linkend='ch-tools-chroot'/>.
+ This issue needs to be resolved before continuing.</para>
+
<para>Install the package:</para>
<screen><userinput remap="install">make install