(maven) branch maven-3.9.x updated: document the only supported value: 4.0.0

[hboutemy]

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hboutemy pushed a commit to branch maven-3.9.x
in repository https://gitbox.apache.org/repos/asf/maven.git


The following commit(s) were added to refs/heads/maven-3.9.x by this push:
     new 4b79fff483 document the only supported value: 4.0.0
4b79fff483 is described below

commit 4b79fff4830465e7bb41bfc588875123dc86519d
Author: Hervé Boutemy <hbout...@apache.org>
AuthorDate: Wed Mar 18 08:43:25 2026 +0100

    document the only supported value: 4.0.0
---
 maven-model/src/main/mdo/maven.mdo | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/maven-model/src/main/mdo/maven.mdo 
b/maven-model/src/main/mdo/maven.mdo
index 9f144d6234..75ea6fbbdd 100644
--- a/maven-model/src/main/mdo/maven.mdo
+++ b/maven-model/src/main/mdo/maven.mdo
@@ -86,7 +86,12 @@
           <name>modelVersion</name>
           <version>4.0.0+</version>
           <required>true</required>
-          <description>Declares to which version of project descriptor this 
POM conforms.</description>
+          <description>
+            <![CDATA[
+            Declares to which version of project descriptor this POM conforms 
to: <code>4.0.0</code> is the only
+            value supported by Maven 3.
+            ]]>
+          </description>
           <type>String</type>
         </field>