diff --git a/README.rst b/README.rst
index 64b3f61..7db4533 100644
--- a/README.rst
+++ b/README.rst
@@ -10,13 +10,14 @@ To install the package with pip::
 
     pip install wagtail-personalisation
 
-Next, include the ``personalisation`` and ``wagtail.contrib.modeladmin`` app in your project's ``INSTALLED_APPS``:
+Next, include the ``personalisation``, ``polymorphic`` and ``wagtail.contrib.modeladmin`` app in your project's ``INSTALLED_APPS``:
 
 .. code-block:: python
 
     INSTALLED_APPS = [
         # ...
         'wagtail.contrib.modeladmin',
+        'polymorphic',
         'personalisation',
         # ...
     ]
@@ -31,4 +32,4 @@ Last but not least, add ``personalisation.middleware.SegmentMiddleware`` to your
         # ...
     ]
 
-Make sure that ``django.contrib.sessions.middleware.SessionMiddleware`` has been added in first, this is a prerequisite for this project.
\ No newline at end of file
+Make sure that ``django.contrib.sessions.middleware.SessionMiddleware`` has been added in first, this is a prerequisite for this project.