diff --git a/lib/integrator.py b/lib/integrator.py
new file mode 100644
index 0000000..a54ff7e
--- /dev/null
+++ b/lib/integrator.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+# -*- coding:utf-8 -*-
+"""
+Implementation of the various integrators for numerical integration.
+"""
+
+def leapfrog():
+    return 0