diff --git a/docs/apidocs/index.rst b/docs/apidocs/index.rst
index 3413c6a..7985618 100644
--- a/docs/apidocs/index.rst
+++ b/docs/apidocs/index.rst
@@ -1,6 +1,6 @@
-******************************
-qiskit-addon-mpf API reference
-******************************
+**********************************
+``qiskit-addon-mpf`` API reference
+**********************************
 
 .. toctree::
    :maxdepth: 1
diff --git a/qiskit_addon_mpf/__init__.py b/qiskit_addon_mpf/__init__.py
index 4a4ab47..e2ee39e 100644
--- a/qiskit_addon_mpf/__init__.py
+++ b/qiskit_addon_mpf/__init__.py
@@ -10,4 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
+# Warning: this module is not documented and it does not have an RST file.
+# If we ever publicly expose interfaces users can import from this module,
+# we should set up its RST file.
 """Multi-product formulas."""