diff --git a/doc/index.rst b/doc/index.rst
index 099326f28e..470023774a 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -92,6 +92,7 @@ Commonly used classes may be imported directly from :mod:`message_ix_models`.
    project/circeular
    project/edits
    project/gea
+   project/scenariomip
    project/shape
    project/ssp
 
diff --git a/doc/project/scenariomip.rst b/doc/project/scenariomip.rst
new file mode 100644
index 0000000000..12e0c8494a
--- /dev/null
+++ b/doc/project/scenariomip.rst
@@ -0,0 +1,12 @@
+ScenarioMIP
+***********
+
+There is currently no dedicated code in :mod:`message_ix_models` associated with this project.
+This page is a place-holder.
+
+See also :doc:`/project/ssp`.
+
+Project information
+===================
+
+- Website: https://wcrp-cmip.org/mips/scenariomip/
diff --git a/doc/project/ssp.rst b/doc/project/ssp.rst
index 7946d20370..16426e3cdf 100644
--- a/doc/project/ssp.rst
+++ b/doc/project/ssp.rst
@@ -3,6 +3,16 @@
 Shared Socioeconomic Pathways (:mod:`.project.ssp`)
 ***************************************************
 
+.. warning::
+
+   The 2024 SSP update is **under development**.
+   For details, see:
+
+   - Tracking issue :issue:`234`.
+   - `Issues and PRs labeled 'p:SSP-2024' <https://github.com/iiasa/message-ix-models/issues?q=label%3Ap:SSP-2024>`_ on the :mod:`.message_ix_models` GitHub repository.
+
+See also :doc:`/project/scenariomip`.
+
 Structure
 =========