diff --git a/en_US.ISO8859-1/books/handbook/ppp-and-slip/chapter.sgml b/en_US.ISO8859-1/books/handbook/ppp-and-slip/chapter.sgml
index 4591a867c3..0605d6cd62 100644
--- a/en_US.ISO8859-1/books/handbook/ppp-and-slip/chapter.sgml
+++ b/en_US.ISO8859-1/books/handbook/ppp-and-slip/chapter.sgml
@@ -699,6 +699,13 @@ nameserver <replaceable>y.y.y.y</replaceable></programlisting>
 		  quote the entire set of phone numbers as shown.</para>
 	      </listitem>
 	    </varlistentry>
+	    
+	    <note>
+	      <para>You must enclose the phone number in quotation marks
+		(<literal>"</literal>) if there is any intention on using
+		spaces in the phone number.  This can cause a simple, yet
+		subtle error</para>
+	    </note>
 
 	    <varlistentry>
 	      <term>Line 13 & 14:</term>