diff --git a/P5/Source/Specs/content.xml b/P5/Source/Specs/content.xml
index 2dc84c84a3..554fec4656 100644
--- a/P5/Source/Specs/content.xml
+++ b/P5/Source/Specs/content.xml
@@ -30,8 +30,8 @@ $Id$
   <content>
     <alternate>
       <elementRef key="valList" minOccurs="1" maxOccurs="1"/>
-      <classRef key="model.contentPart" minOccurs="1" maxOccurs="unbounded"/>
-      <anyElement minOccurs="1" maxOccurs="unbounded" require="http://relaxng.org/ns/compatibility/annotations/1.0 http://relaxng.org/ns/structure/1.0"/>
+      <classRef key="model.contentPart" minOccurs="1" maxOccurs="1"/>
+      <anyElement minOccurs="1" maxOccurs="1" require="http://relaxng.org/ns/compatibility/annotations/1.0 http://relaxng.org/ns/structure/1.0"/>
     </alternate>
   </content>
   <attList>
@@ -149,6 +149,9 @@ $Id$
       </content>
     </egXML>
   </exemplum>
+  <remarks versionDate="2023-03-30" xml:lang="en">
+    <p>It is required that the <gi>content</gi> element has only one child element. If several RELAX NG elements are desired, they must be wrapped in a <gi>rng:div</gi>.</p>
+  </remarks>
   <listRef>
     <ptr target="#TDTAG"/>
   </listRef>