diff --git a/tuf/api/__init__.py b/tuf/api/__init__.py
index e69de29bb2..a6176da2dc 100644
--- a/tuf/api/__init__.py
+++ b/tuf/api/__init__.py
@@ -0,0 +1,12 @@
+"""TUF new API
+
+This package contains all modules related to the TUF refactoring effort.
+
+"""
+# This reference implementation produces metadata intended to conform to
+# version 1.0.0 of the TUF specification, and is expected to consume metadata
+# conforming to version 1.0.0 of the TUF specification.
+# All downloaded metadata must be equal to our supported major version of 1.
+# For example, "1.4.3" and "1.0.0" are supported.  "2.0.0" is not supported.
+# See https://github.com/theupdateframework/specification
+SPECIFICATION_VERSION = ["1", "0", "0"]