diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,6 +1,7 @@
 # FixedCal
 
 [![CI](https://github.com/PyryL/fixedcal/actions/workflows/main.yml/badge.svg)](https://github.com/PyryL/fixedcal/actions)
+[![codecov](https://codecov.io/gh/PyryL/fixedcal/branch/main/graph/badge.svg?token=ZMYYLBUPNA)](https://codecov.io/gh/PyryL/fixedcal)
 
 Python package for international fixed calendar dates.