diff --git a/server/certificates/cached_challengers.go b/server/certificates/cached_challengers.go
index 2a30c26..bc9ea67 100644
--- a/server/certificates/cached_challengers.go
+++ b/server/certificates/cached_challengers.go
@@ -47,7 +47,7 @@ func (a AcmeHTTPChallengeProvider) CleanUp(domain, token, _ string) error {
 }
 
 func SetupHTTPACMEChallengeServer(challengeCache cache.SetGetKey, sslPort uint) http.HandlerFunc {
-	// not null if a custom port needs to be added to https redirects
+	// handle custom-ssl-ports to be added on https redirects
 	portPart := ""
 	if sslPort != 443 {
 		portPart = fmt.Sprintf(":%d", sslPort)