diff --git a/doc/src/sgml/file-fdw.sgml b/doc/src/sgml/file-fdw.sgml
index 56d696c323c..c9d61c2e2eb 100644
--- a/doc/src/sgml/file-fdw.sgml
+++ b/doc/src/sgml/file-fdw.sgml
@@ -115,6 +115,17 @@
    </listitem>
   </varlistentry>
 
+  <varlistentry>
+   <term><literal>default</literal></term>
+
+   <listitem>
+    <para>
+     Specifies the string that represents a default value,
+     the same as <command>COPY</command>'s <literal>DEFAULT</literal> option.
+    </para>
+   </listitem>
+  </varlistentry>
+
   <varlistentry>
    <term><literal>encoding</literal></term>