diff --git a/requirements.txt b/requirements/core.txt
similarity index 100%
rename from requirements.txt
rename to requirements/core.txt
diff --git a/requirements/optional.txt b/requirements/optional.txt
new file mode 100644
index 0000000..7909d5e
--- /dev/null
+++ b/requirements/optional.txt
@@ -0,0 +1 @@
+psycopg2==2.5.2