diff --git a/doc/sphinx/source/releases.rst b/doc/sphinx/source/releases.rst
index 6878c52d45..7fcfdfdd36 100644
--- a/doc/sphinx/source/releases.rst
+++ b/doc/sphinx/source/releases.rst
@@ -21,7 +21,8 @@ developments and to mark versions used to produce main results. The
 significant releases since the code was made public are:
 
 `Version 4.0.9 <https://github.com/NNPDF/nnpdf/releases/tag/4.0.9>`_
-    Final release of the 4.0 family for PDF fitting.
+    Release for 4.0 N3LO; last release fully backwards-compatible with 4.0 pipeline.
+    4.0 runcards will still work but external tools, and data and theory not used in the 4.0 family of fits will no longer be guaranteed to work from 4.0.10 onwards
     Last release compatible with the old commondata format and that accepts apfel as evolution code.
 `Version 4.0.8 <https://github.com/NNPDF/nnpdf/releases/tag/4.0.8>`_
     Release for the `QED <https://arxiv.org/abs/2401.08749>`_ and `MHOU <https://arxiv.org/abs/2401.10319>`_ papers.