diff --git a/xml/xml-psi-impl/src/com/intellij/xml/impl/schema/XmlElementDescriptorImpl.java b/xml/xml-psi-impl/src/com/intellij/xml/impl/schema/XmlElementDescriptorImpl.java
index 6f996852ef8c..df7df1ef0724 100644
--- a/xml/xml-psi-impl/src/com/intellij/xml/impl/schema/XmlElementDescriptorImpl.java
+++ b/xml/xml-psi-impl/src/com/intellij/xml/impl/schema/XmlElementDescriptorImpl.java
@@ -229,7 +229,7 @@ public class XmlElementDescriptorImpl extends XsdEnumerationDescriptor<XmlTag>
       if (context != null &&
           descriptor.canContainTag(context.getLocalName(), contextNs = context.getNamespace(), context) &&
           (!contextNs.equals(getNamespace()) || descriptor.hasAnyInContentModel()) &&
-          containingFile instanceof XmlFile) { // JSXmlLiteralExpressionImpl is crazy
+          containingFile instanceof XmlFile) { // JSXmlLiteralExpressionImpl, being an xml element itself, may be contained in non-XML file
         final XmlNSDescriptor nsDescriptor = getNSDescriptor();
 
         if (nsDescriptor != null) {