diff --git a/CITATION.cff b/CITATION.cff
new file mode 100644
index 0000000..0796904
--- /dev/null
+++ b/CITATION.cff
@@ -0,0 +1,12 @@
+cff-version: 1.2.0
+message: If you reference this tool in publication, please cite it as below.
+title: Calendar Heatmap
+abstract: Calendar Heatmap visualization in Go
+authors:
+- family-names: Dubina
+  given-names: Nikolay
+version: 2.1
+date-released: 2021-08-21
+license: MIT
+repository-code: https://github.com/nikolaydubina/calendarheatmap
+url: http://calendarheatmap.io