diff --git a/INSTALL b/INSTALL
index a445f4f..40ce960 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1184,3 +1184,8 @@ TLS-over-SCTP.
 
 The relay side is not changing - the relay communications will still be UDP
 or TCP.
+
+XXV. Prometheus support.
+
+See for source and releases for debian packages:
+https://github.com/digitalocean/prometheus-client-c