diff --git a/service_client.go b/service_client.go
index 150da60..feed758 100644
--- a/service_client.go
+++ b/service_client.go
@@ -4,25 +4,32 @@
 	"strings"
 )
 
-// ServiceClient stores details about a specific service that are necessary for further interactions
-// with that service API, as well as utility methods for service implementation.
+// ServiceClient stores details about a specific service that are necessary for further interactions with that service API, as well
+// as utility methods for service implementation.
 //
-// Generally, you will acquire a ServiceClient by calling the NewClient() function in the
-// appropriate service package.
+// Generally, you will acquire a ServiceClient by calling the NewClient() function in the appropriate service package.
 type ServiceClient struct {
-	authority AuthResults
-	options   AuthOptions
-	endpoint  string
-	tokenID   string
+
+	// Authority caches results of the most recent authentication.
+	Authority AuthResults
+
+	// Options remembers the original authentication parameters, if reauthentication is enabled.
+	Options AuthOptions
+
+	// Endpoint is the base URL of the relevant API.
+	Endpoint string
+
+	// TokenID is the most recently valid token issued.
+	TokenID string
 }
 
 // ServiceURL constructs a URL for a resource belonging to this client.
 func (client *ServiceClient) ServiceURL(parts ...string) string {
-	return client.endpoint + strings.Join(parts, "/")
+	return client.Endpoint + strings.Join(parts, "/")
 }
 
 // AuthenticatedHeaders returns a map of HTTP headers that are common for all authenticated service
 // requests.
 func (client *ServiceClient) AuthenticatedHeaders() map[string]string {
-	return map[string]string{"X-Auth-Token": client.tokenID}
+	return map[string]string{"X-Auth-Token": client.TokenID}
 }