diff --git a/reference/libxml/constants.xml b/reference/libxml/constants.xml
index e5dd9fe275..e0929e7a75 100644
--- a/reference/libxml/constants.xml
+++ b/reference/libxml/constants.xml
@@ -166,6 +166,17 @@
     </simpara>
    </listitem>
   </varlistentry>
+  <varlistentry>
+   <term>
+    <constant>LIBXML_PARSEHUGE</constant>
+     (<type>integer</type>)
+   </term>
+   <listitem>
+    <simpara>
+     Sets XML_PARSE_HUGE flag, which relaxes any hardcoded limit from the parser.
+    </simpara>
+   </listitem>
+  </varlistentry>
   <varlistentry>
    <term>
     <constant>LIBXML_XINCLUDE</constant>