diff --git a/alignn/__init__.py b/alignn/__init__.py
index 5c1945dd..ed67e2c1 100644
--- a/alignn/__init__.py
+++ b/alignn/__init__.py
@@ -1,2 +1,2 @@
 """Version number."""
-__version__ = "2023.01.08"
+__version__ = "2023.01.09"
diff --git a/alignn/ff/__init__.py b/alignn/ff/__init__.py
new file mode 100644
index 00000000..a39d10c1
--- /dev/null
+++ b/alignn/ff/__init__.py
@@ -0,0 +1 @@
+"""Module for force-fields."""
diff --git a/setup.py b/setup.py
index 6859c335..65a467b7 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 
 setuptools.setup(
     name="alignn",
-    version="2023.01.08",
+    version="2023.01.09",
     author="Kamal Choudhary, Brian DeCost",
     author_email="kamal.choudhary@nist.gov",
     description="alignn",