diff --git a/docs/installation.rst b/docs/installation.rst
index 3990aae..a117612 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -13,3 +13,10 @@ be added to the app's database via the usual django ``migrate`` command.
 We should also add ``pgpubsub`` and ``pgtrigger`` into ``INSTALLED_APPS``.
 If we wish to run the ``pgpubsub`` tests, we need to add
 ``pgpubsub.tests`` into ``INSTALLED_APPS`` too.
+
+``pgpubsub`` is compatible with both ``psycopg2`` and ``psycopg``. Install the
+version you prefer and ``pgpubsub`` will use it. If both are installed
+``psycopg2`` is prefered in order to be compatible with the previous
+``pgpubsub`` versions. Set environment variable
+``PGPUBSUB_USE_PSYCOPG_V3=True`` to override and force ``psycopg`` version 3
+usage.
diff --git a/pgpubsub/compatibility.py b/pgpubsub/compatibility.py
index 047ec47..902723b 100644
--- a/pgpubsub/compatibility.py
+++ b/pgpubsub/compatibility.py
@@ -1,5 +1,9 @@
+import os
 
 try:
+    if os.getenv('PGPUBSUB_USE_PSYCOPG_V3', 'False') == 'True':
+        raise ImportError()
+
     from psycopg2._psycopg import Notify
 
     class ConnectionWrapper: