diff --git a/component/resolver/host.go b/component/resolver/host.go
index ca90cd27..49168e2b 100644
--- a/component/resolver/host.go
+++ b/component/resolver/host.go
@@ -20,6 +20,7 @@ func NewHosts(hosts *trie.DomainTrie[HostValue]) Hosts {
 	}
 }
 
+// Return the search result and whether to match the parameter `isDomain`
 func (h *Hosts) Search(domain string, isDomain bool) (*HostValue, bool) {
 	value := h.DomainTrie.Search(domain)
 	if value == nil {