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-rw-r--r--type/rate.py2
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diff --git a/type/rate.py b/type/rate.py
index c365848..5848906 100644
--- a/type/rate.py
+++ b/type/rate.py
@@ -1,5 +1,7 @@
#!/usr/bin/env python3
+# © Copyright 2021-2022, Scott Gasch
+
"""A class to represent a rate of change."""
from typing import Optional