diff --git a/server/dns/dns.go b/server/dns/dns.go
index f6ce4bb..e73f70c 100644
--- a/server/dns/dns.go
+++ b/server/dns/dns.go
@@ -11,7 +11,7 @@ import (
 const lookupCacheValidity = 30 * time.Second
 const defaultPagesRepo = "pages"
 
-// TODO(): refactor to not use global variables
+// TODO(#316): refactor to not use global variables
 var lookupCache *expirable.LRU[string, string] = expirable.NewLRU[string, string](4096, nil, lookupCacheValidity)
 
 // GetTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix.