diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index abcbaad5..931ca060 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -73,6 +73,8 @@ incorporates retrofitting options to hydrogen.
 
 * Updated `data bundle <https://zenodo.org/record/5824485/files/pypsa-eur-sec-data-bundle.tar.gz>`_ that includes the hydrogan salt cavern storage potentials.
 
+* Updated and extended documentation in <https://pypsa-eur-sec.readthedocs.io/en/latest/>
+
 **Bugfixes**
 
 * The CO2 sequestration limit implemented as GlobalConstraint (introduced in the previous version)