diff --git a/reference/mongo/mongoclient/construct.xml b/reference/mongo/mongoclient/construct.xml
index 184c9445a0..262eb533ab 100644
--- a/reference/mongo/mongoclient/construct.xml
+++ b/reference/mongo/mongoclient/construct.xml
@@ -120,6 +120,32 @@ mongodb://[username:password@]host1[:port1][,host2[:port2:],...]/db
           host list.
          </para>
         </listitem>
+        <listitem>
+         <para>
+          <literal>"fsync"</literal>
+         </para>
+         <para>
+          When <literal>fsync</literal> is set, all write operations on the
+          database will block until the database server has flushed its
+          database files to disk. This makes write operations a lot slower,
+          but it guarantees that the write operation has succeeded and
+          committed to disk. Please avoid <emphasis>using</emphasis> this
+          option and use the <literal>journal</literal> option instead,
+          perhaps in combination with the <literal>w</literal> option.
+         </para>
+        </listitem>
+        <listitem>
+         <para>
+          <literal>"journal"</literal>
+         </para>
+         <para>
+          When <literal>journal</literal> is set, all write operations on the
+          database will block until the database server has flushed the
+          journal to disk. This makes the write operations marginally slower,
+          but it guarantees that the write operation has succeeded and the
+          operation can be recovered in case of total system failure.
+         </para>
+        </listitem>
         <listitem>
          <para>
           <literal>"password"</literal>