diff --git a/reference/stream/streamwrapper/stream-seek.xml b/reference/stream/streamwrapper/stream-seek.xml
index 7e66e59359..7054238e1c 100644
--- a/reference/stream/streamwrapper/stream-seek.xml
+++ b/reference/stream/streamwrapper/stream-seek.xml
@@ -46,6 +46,13 @@
         <member><constant>SEEK_END</constant> - Set position to end-of-file plus <parameter>offset</parameter>.</member>
        </simplelist>
       </para>
+      <note>
+       <simpara>
+        The current implementation never sets <parameter>whence</parameter> to
+        <constant>SEEK_CUR</constant>; instead such seeks are internally converted
+        to <constant>SEEK_SET</constant> seeks.
+       </simpara>
+      </note>
      </listitem>
     </varlistentry>
    </variablelist>