diff --git a/unimore_bda_6/vendor/__init__.py b/unimore_bda_6/vendor/__init__.py
new file mode 100644
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+++ b/unimore_bda_6/vendor/__init__.py
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+"""
+This module contains modules downloaded from the Internet and adapted for the project.
+
+Edits to the respective modules are released under the same license as the modules themselves.
+
+Currently:
+
+* the adaptation of :mod:`potts` is released under the CC BY-NC-SA 3.0 license.
+"""