diff --git a/src/doc/user/usermanual.html b/src/doc/user/usermanual.html
index 321df680..6db29f82 100644
--- a/src/doc/user/usermanual.html
+++ b/src/doc/user/usermanual.html
@@ -5513,6 +5513,13 @@ text/html       [file:///Users/uncrypted-dockes/projets/bateaux/ilur/factEtCie/r
               Categories are OR'ed like MIME types above, and can
               be negated with <code class="literal">-</code>.</p>
             </li>
+            <li class="listitem">
+              <p><code class="literal">issub</code> for specifying
+              that only standalone (<code class=
+              "literal">issub:0</code>) or only embedded
+              (<code class="literal">issub:1</code>) documents
+              should be returned as results.</p>
+            </li>
           </ul>
         </div>
         <div class="note" style=
@@ -5520,10 +5527,11 @@ text/html       [file:///Users/uncrypted-dockes/projets/bateaux/ilur/factEtCie/r
           <h3 class="title">Note</h3>
           <p><code class="literal">mime</code>, <code class=
           "literal">rclcat</code>, <code class=
-          "literal">size</code> and <code class=
-          "literal">date</code> criteria always affect the whole
-          query (they are applied as a final filter), even if set
-          with other terms inside a parenthese.</p>
+          "literal">size</code>, <code class="literal">issub</code>
+          and <code class="literal">date</code> criteria always
+          affect the whole query (they are applied as a final
+          filter), even if set with other terms inside a
+          parenthese.</p>
         </div>
         <div class="note" style=
         "margin-left: 0.5in; margin-right: 0.5in;">
diff --git a/src/doc/user/usermanual.xml b/src/doc/user/usermanual.xml
index 7b5a1e18..ea717172 100644
--- a/src/doc/user/usermanual.xml
+++ b/src/doc/user/usermanual.xml
@@ -4213,13 +4213,19 @@ text/html       [file:///Users/uncrypted-dockes/projets/bateaux/ilur/factEtCie/r
         <literal>-</literal>.</para>
         </listitem>
 
+        <listitem><para><literal>issub</literal>
+            for specifying that only standalone (<literal>issub:0</literal>) or
+            only embedded (<literal>issub:1</literal>) documents should be
+            returned as results.</para>
+        </listitem>
+
       </itemizedlist>
 
       <note><para>
-        <literal>mime</literal>, <literal>rclcat</literal>,
-        <literal>size</literal> and <literal>date</literal> criteria
-        always affect the whole query (they are applied as a final
-        filter), even if set with other terms inside a parenthese.</para>
+        <literal>mime</literal>, <literal>rclcat</literal>, <literal>size</literal>,
+        <literal>issub</literal> and <literal>date</literal> criteria always
+        affect the whole query (they are applied as a final filter), even if set
+        with other terms inside a parenthese.</para>
       </note>
 
       <note><para>