diff --git a/postlfs/security/linux-pam.xml b/postlfs/security/linux-pam.xml
index 3759d42a8a..79ee447448 100644
--- a/postlfs/security/linux-pam.xml
+++ b/postlfs/security/linux-pam.xml
@@ -145,11 +145,34 @@
 make</userinput></screen>
 
     <para>
-      To test the results, a configuration file must be created. This file
-      will be removed after the tests have completed. Ensure there are no errors
-      produced by the tests before continuing the installation. First create the
-      configuration file by issuing the following commands as the
-      <systemitem class="username">root</systemitem> user:
+      To test the results, a suitable <filename>/etc/pam.d/other</filename>
+      configuration file must exist.
+    </para>
+
+    <caution>
+      <title>Reinstallation or upgrade of Linux PAM</title>
+      <para>
+        If you have a system with Linux PAM installed and working, be careful
+        when modifying the files in
+        <filename class="directory">/etc/pam.d</filename>, since your system
+        may become totally unusable. If you want to run the tests, you do not
+        need to create another <filename>/etc/pam.d/other</filename> file. The
+        installed one can be used for that purpose.
+      </para>
+
+      <para>
+         You should also be aware that <command>make install</command>
+         overwrites the configuration files in
+         <filename class="directory">/etc/security</filename> as well as
+         <filename>/etc/environment</filename. In case you
+         have modified those files, be sure to backup them.
+      </para>
+    </caution>
+
+    <para>
+      For a first installation, create the configuration file by issuing the
+      following commands as the <systemitem class="username">root</systemitem>
+      user:
     </para>
 
 <screen role="root"><userinput>install -v -m755 -d /etc/pam.d &amp;&amp;
@@ -163,11 +186,13 @@ EOF</userinput></screen>
 
     <para>
       Now run the tests by issuing <command>make check</command>.
+      Ensure there are no errors produced by the tests before continuing the
+      installation.
     </para>
 
     <para>
-      Remove the configuration file created earlier by issuing the
-      following command as the
+      Only in case of a first installation, remove the configuration file
+      created earlier by issuing the following command as the
       <systemitem class="username">root</systemitem> user:
     </para>