diff --git a/reference/dom/domdocument/schemavalidate.xml b/reference/dom/domdocument/schemavalidate.xml
index 30a5a1b311..ea87005edb 100644
--- a/reference/dom/domdocument/schemavalidate.xml
+++ b/reference/dom/domdocument/schemavalidate.xml
@@ -4,7 +4,7 @@
  <refnamediv>
   <refname>DOMDocument::schemaValidate</refname>
   <refpurpose>
-   Validates a document based on a schema
+   Validates a document based on a schema. Only XML Schema 1.0 is supported.
   </refpurpose>
  </refnamediv>
  <refsect1 role="description">