diff --git a/chapter06/libcap.xml b/chapter06/libcap.xml
index e15dd9c20..1a71b7b28 100644
--- a/chapter06/libcap.xml
+++ b/chapter06/libcap.xml
@@ -129,7 +129,8 @@ ln -sfv ../../lib/$(readlink /usr/lib/libcap.so) /usr/lib/libcap.so</userinput><
       <varlistentry id="libcap">
         <term><filename class="libraryfile">libcap</filename></term>
         <listitem>
-          <para>Contains the library functions for manipulating capabilities</para>
+          <para>Contains the library functions for manipulating POSIX 1003.1e
+          capabilities</para>
           <indexterm zone="ch-system-libcap libcap">
             <primary sortas="c-libcap">libcap</primary>
           </indexterm>