diff --git a/reference/simplexml/simplexmlelement/construct.xml b/reference/simplexml/simplexmlelement/construct.xml
index ec7f50c523..54cb36fec3 100644
--- a/reference/simplexml/simplexmlelement/construct.xml
+++ b/reference/simplexml/simplexmlelement/construct.xml
@@ -58,6 +58,7 @@
      <term><parameter>ns</parameter></term>
      <listitem>
       <para>
+       Namespace prefix or URI.
       </para>
      </listitem>
     </varlistentry>
@@ -65,6 +66,8 @@
      <term><parameter>is_prefix</parameter></term>
      <listitem>
       <para>
+       &true; if <parameter>ns</parameter> is a prefix, &false; if it's a URI;
+       defaults to &false;.
       </para>
      </listitem>
     </varlistentry>