diff --git a/ip/resolver/service.go b/ip/resolver/service.go
index 4852363..92aba26 100644
--- a/ip/resolver/service.go
+++ b/ip/resolver/service.go
@@ -8,12 +8,16 @@ import (
 	"dnsupdater/ip"
 )
 
+// Interface that IP Lookup Services must implement.
 type Service interface {
+	// Get the name of the serivce
 	Name() string
 
+	// Lookup the public ip.
 	Lookup(ctx context.Context) (net.IP, error)
 }
 
+// Constant name for the virtual WAN interface
 const WAN_IFACE = "wan"
 
 func LookupWrapper(service Service) ip.NetInterfaceIPResolver {