diff --git a/reference/dom/domxpath/evaluate.xml b/reference/dom/domxpath/evaluate.xml
index 2293ac9a11..786cdc36b3 100644
--- a/reference/dom/domxpath/evaluate.xml
+++ b/reference/dom/domxpath/evaluate.xml
@@ -60,6 +60,11 @@
    Returns a typed result if possible or a <classname>DOMNodeList</classname> 
    containing all nodes matching the given XPath <parameter>expression</parameter>. 
   </para>
+  <para>
+   If the <parameter>expression</parameter> is malformed or the
+   <parameter>contextnode</parameter> is invalid,
+   <methodname>DOMXPath::evaluate</methodname> returns &false;.
+  </para>
  </refsect1>
  <refsect1 role="changelog">
   &reftitle.changelog;
diff --git a/reference/dom/domxpath/query.xml b/reference/dom/domxpath/query.xml
index 2495adff8d..ab4e199f8f 100644
--- a/reference/dom/domxpath/query.xml
+++ b/reference/dom/domxpath/query.xml
@@ -56,9 +56,15 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns a <classname>DOMNodeList</classname> containing all nodes matching 
-   the given XPath <parameter>expression</parameter>. Any expression which do
-   not return nodes will return an empty <classname>DOMNodeList</classname>.
+   Returns a <classname>DOMNodeList</classname> containing all nodes matching
+   the given XPath <parameter>expression</parameter>. Any expression which
+   does not return nodes will return an empty
+   <classname>DOMNodeList</classname>.
+  </para>
+  <para>
+   If the <parameter>expression</parameter> is malformed or the
+   <parameter>contextnode</parameter> is invalid,
+   <methodname>DOMXPath::query</methodname> returns &false;.
   </para>
  </refsect1>
  <refsect1 role="changelog">