diff --git a/reference/ftp/constants.xml b/reference/ftp/constants.xml
index aff043a8b1..0e8929e691 100644
--- a/reference/ftp/constants.xml
+++ b/reference/ftp/constants.xml
@@ -19,7 +19,7 @@
     (<type>integer</type>)
    </term>
    <listitem>
-    <para></para>
+    <para>Alias of <constant>FTP_ASCII</constant>.</para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.ftp-binary">
@@ -37,7 +37,7 @@
     (<type>integer</type>)
    </term>
    <listitem>
-    <para></para>
+    <para>Alias of <constant>FTP_BINARY</constant>.</para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.ftp-timeout-sec">