diff --git a/chapter08/grep.xml b/chapter08/grep.xml
index d06a1ba85..9861d239f 100644
--- a/chapter08/grep.xml
+++ b/chapter08/grep.xml
@@ -77,7 +77,8 @@
       <varlistentry id="egrep">
         <term><command>egrep</command></term>
         <listitem>
-          <para>Prints lines matching an extended regular expression</para>
+          <para>Prints lines matching an extended regular expression.
+          It is obsoleted, use <command>grep -E</command> instead</para>
           <indexterm zone="ch-system-grep egrep">
             <primary sortas="b-egrep">egrep</primary>
           </indexterm>
@@ -87,7 +88,8 @@
       <varlistentry id="fgrep">
         <term><command>fgrep</command></term>
         <listitem>
-          <para>Prints lines matching a list of fixed strings</para>
+          <para>Prints lines matching a list of fixed strings.
+          It is obsoleted, use <command>grep -F</command> instead</para>
           <indexterm zone="ch-system-grep fgrep">
             <primary sortas="b-fgrep">fgrep</primary>
           </indexterm>