diff --git a/docs/maintenance.md b/docs/maintenance.md
index 1d56d9918bdf351259e931f06bd523076d48c86f..b33177fe41f975535c2607cdf83b0ad7b3a59718 100644
--- a/docs/maintenance.md
+++ b/docs/maintenance.md
@@ -48,7 +48,9 @@ Filter out redundant `flux` messages:
 
 #### Cert-manager
 
-`cert-manager` messages containing `chat`:
+Cert manager is responsible for requesting Let's Encrypt TLS certificates.
+
+Query `cert-manager` messages containing `chat`:
 
     {app="cert-manager"} |= "chat"