diff --git a/README.rst b/README.rst
index 7ef9d47..9a46fcd 100644
--- a/README.rst
+++ b/README.rst
@@ -8,10 +8,13 @@ iterative Hertz model for a spherical indenter (modified by Sneddon)
 for the `nanite <https://github.com/AFM-analysis/nanite>`_
 AFM force-indentation analysis package.
 
+This model is an optional component of nanite and is only of academic
+interest.
+
 
 Installation
 ------------
-To install the latest release, simply run:
+To install the latest release:
 
 ::
 
diff --git a/src/nanite_model_sneddon_spher/model_sneddon_spherical.pyx b/src/nanite_model_sneddon_spher/model_sneddon_spherical.pyx
index 6a8a4ec..e15bbb8 100644
--- a/src/nanite_model_sneddon_spher/model_sneddon_spherical.pyx
+++ b/src/nanite_model_sneddon_spher/model_sneddon_spherical.pyx
@@ -22,6 +22,8 @@ def hertz_spherical(delta, double E, double R, double nu,
                     double contact_point=0, double baseline=0):
     r"""Hertz model for Spherical indenter - modified by Sneddon
 
+    This model is only available after installing the
+    `nanite_model_sneddon_spher` Python package.
 
     .. math::