diff --git a/HISTORY.md b/HISTORY.md
index b0c902e3..4a15f02e 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,7 @@ Here's Cloudflare incidents.
 [//]: # (do not edit me; start)
 
 
+- 2021-05-27: [Connectivity issues on Unused Prefixes](https://web.archive.org/web/https://www.cloudflarestatus.com/incidents/zcxgtvrp2tsy)
 - 2021-05-25: [Load Balancing slow steering](https://web.archive.org/web/https://www.cloudflarestatus.com/incidents/qntwrjsq3k96)
 - 2021-05-25: [Increased TLS Errors when using Regional Services](https://web.archive.org/web/https://www.cloudflarestatus.com/incidents/87thmgx0q3tx)
 - 2021-05-25: [Network Performance Issues in India](https://web.archive.org/web/https://www.cloudflarestatus.com/incidents/ds5yfzp84zh7)