diff --git a/cchat.go b/cchat.go
index 0d3816a..2afec08 100644
--- a/cchat.go
+++ b/cchat.go
@@ -731,9 +731,9 @@ type ServersContainer interface {
 	SetServers([]Server)
 }
 
-// A service is a complete service that's capable of multiple sessions. It has
-// to implement the Authenticate() method, which returns multiple
-// implementations of Authenticator.
+// Service is a complete service that's capable of multiple sessions. It has to
+// implement the Authenticate() method, which returns multiple implementations
+// of Authenticator.
 //
 // A service can implement SessionRestorer, which would indicate the frontend
 // that it can restore past sessions. Sessions are saved using the SessionSaver
@@ -745,6 +745,13 @@ type ServersContainer interface {
 // configurations must be optional, as frontends may not implement a
 // configurator UI.
 type Service interface {
+	// Identifier returns the unique identifier for the service. There is no
+	// enforced representation, but services are recommended to follow the Reverse
+	// Domain Name Notation for consistency. An example of that would be:
+	//
+	//    com.github.diamondburned.cchat-discord
+	//    com.github.username.service
+	Identifier
 	// Namer returns the name of the service.
 	Namer
 
diff --git a/repository/gob/repository.gob b/repository/gob/repository.gob
index 514f2e3..35935ee 100644
Binary files a/repository/gob/repository.gob and b/repository/gob/repository.gob differ
diff --git a/repository/main.go b/repository/main.go
index 19e1a55..83d9972 100644
--- a/repository/main.go
+++ b/repository/main.go
@@ -651,7 +651,7 @@ var Main = Packages{
 			},
 		}, {
 			Comment: Comment{`
-				A service is a complete service that's capable of multiple
+				Service is a complete service that's capable of multiple
 				sessions. It has to implement the Authenticate() method, which
 				returns multiple implementations of Authenticator.
 
@@ -668,6 +668,17 @@ var Main = Packages{
 			`},
 			Name: "Service",
 			Embeds: []EmbeddedInterface{{
+				Comment: Comment{`
+					Identifier returns the unique identifier for the service. There
+					is no enforced representation, but services are recommended to
+					follow the Reverse Domain Name Notation for consistency. An
+					example of that would be:
+
+						com.github.diamondburned.cchat-discord
+						com.github.username.service
+				`},
+				InterfaceName: "Identifier",
+			}, {
 				Comment: Comment{`
 					Namer returns the name of the service.
 				`},