diff --git a/applications/NXmx.nxdl.xml b/applications/NXmx.nxdl.xml
index 76c1d1b1aa..fc7341ff80 100644
--- a/applications/NXmx.nxdl.xml
+++ b/applications/NXmx.nxdl.xml
@@ -60,6 +60,13 @@
 		</doc>
 
 		<group type="NXentry">
+
+			<doc>
+				Note, it is recommended that ``file_name`` and ``file_time`` are included
+				as attributes at the root of a file that includes :ref:`NXmx`. See
+				:ref:`NXroot`.
+			</doc>
+
 			<field name="title" type="NX_CHAR" minOccurs="0" />
 
 			<field name="start_time" type="NX_DATE_TIME" minOccurs="0" />