diff --git a/README.md b/README.md
index 6bfac25..9551e57 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,6 @@ See [our spec file](OpenMetrics.md) and [our proto](proto/openmetrics_data_model
 # Mailing list
 
 Join the [mailing list](https://groups.google.com/forum/m/#!forum/openmetrics) or follow us on [Twitter](https://twitter.com/OpenMetricsIO)
+
+# Code of Conduct
+To make Prometheus a welcoming and harassment-free experience for everyone, we follow the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).