diff --git a/polymorphic/__version__.py b/polymorphic/__version__.py
new file mode 100644
index 0000000..a4a9b3d
--- /dev/null
+++ b/polymorphic/__version__.py
@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+"""
+See PEP 386 (https://www.python.org/dev/peps/pep-0386/)
+
+Release logic:
+    1. Remove "dev#" from current (this file, now).
+    2. git commit
+    3. git tag <version>
+    4. push to pypi + push --tags to github
+    5. bump the version, append ".dev0"
+    6. git commit
+    7. push to github
+"""
+__version__ = "0.4.2"
+