diff --git a/doc/src/sgml/file-fdw.sgml b/doc/src/sgml/file-fdw.sgml
index 4c34ad9cc92..d6712cbbfaf 100644
--- a/doc/src/sgml/file-fdw.sgml
+++ b/doc/src/sgml/file-fdw.sgml
@@ -28,7 +28,8 @@
 
    <listitem>
     <para>
-     Specifies the file to be read.  Must be an absolute path name.
+     Specifies the file to be read.  Relative paths are relative to the
+     data directory.
      Either <literal>filename</literal> or <literal>program</literal> must be
      specified, but not both.
     </para>