diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..5741dea
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+python 3.9.1
diff --git a/assess.py b/assess.py
new file mode 100644
index 0000000..e69de29
diff --git a/requirements.txt b/requirements.txt
index 922a2f3..7a03dec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 networkx~=2.8
+scikit-learn~=1.1