diff --git a/config.go b/config.go
new file mode 100644
index 0000000..b6ead09
--- /dev/null
+++ b/config.go
@@ -0,0 +1,23 @@
+package main
+
+// Config holds the configuration for Idicon service.
+type Config struct {
+	Defaults Defaults     `toml:"defaults"`
+	Users    []UserConfig `toml:"users"`
+}
+
+// Defaults holds default configuration values to be used as defaults for all users.
+type Defaults struct {
+	ColorScheme string `toml:"color-scheme"`
+	Pattern     string `toml:"pattern"`
+}
+
+// UserConfig holds user specific configuration.
+// ID is the id od the user in plain text,
+// Alias is the alias to be used to generate the id icon.
+type UserConfig struct {
+	ID          string `toml:"id"`
+	Alias       string `toml:"alias"`
+	ColorScheme string `toml:"color-scheme"`
+	Pattern     string `toml:"pattern"`
+}
diff --git a/idicon.go b/idicon.go
index 5ded080..e24d955 100644
--- a/idicon.go
+++ b/idicon.go
@@ -124,7 +124,7 @@ func drawImage(data []bool, blocks int, size int, c color.Color) *image.NRGBA {
 	return img
 }
 
-func RequestHandler(w http.ResponseWriter, r *http.Request) {
+func requestHandler(w http.ResponseWriter, r *http.Request) {
 	id := mux.Vars(r)["id"]
 
 	size, err := strconv.Atoi(r.URL.Query().Get("s"))
@@ -143,7 +143,7 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	for _, userConfig := range config.Users {
-		if hashBytes(id) == hashBytes(userConfig.Id) {
+		if hashBytes(id) == hashBytes(userConfig.ID) {
 			id = userConfig.Alias
 			if len(userConfig.ColorScheme) > 0 {
 				colorScheme = userConfig.ColorScheme
@@ -170,23 +170,6 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) {
 
 }
 
-type Config struct {
-	Defaults Defaults     `toml:"defaults"`
-	Users    []UserConfig `toml:"users"`
-}
-
-type Defaults struct {
-	ColorScheme string `toml:"color-scheme"`
-	Pattern     string `toml:"pattern"`
-}
-
-type UserConfig struct {
-	Id          string `toml:"id"`
-	Alias       string `toml:"alias"`
-	ColorScheme string `toml:"color-scheme"`
-	Pattern     string `toml:"pattern"`
-}
-
 var (
 	config Config
 )
@@ -219,7 +202,7 @@ func main() {
 	configure(*configFile)
 
 	router := mux.NewRouter()
-	router.HandleFunc("/avatar/{id}", RequestHandler)
+	router.HandleFunc("/avatar/{id}", requestHandler)
 	log.Println("Starting ...")
 	log.Fatal(http.ListenAndServe(":8000", router))
 }
diff --git a/idicon_test.go b/idicon_test.go
index c025fa5..1988ef6 100644
--- a/idicon_test.go
+++ b/idicon_test.go
@@ -27,7 +27,7 @@ var gh2 []byte
 
 func testRouter() *mux.Router {
 	router := mux.NewRouter()
-	router.HandleFunc("/avatar/{id}", RequestHandler)
+	router.HandleFunc("/avatar/{id}", requestHandler)
 	return router
 }
 
@@ -116,7 +116,7 @@ func TestUsesConfig(t *testing.T) {
 	configure("./testdata/testconfig.toml")
 
 	if config.Defaults.ColorScheme != "gh" ||
-		config.Users[0].Id != "example" ||
+		config.Users[0].ID != "example" ||
 		config.Users[0].Alias != "42" ||
 		config.Users[0].ColorScheme != "gh" ||
 		config.Users[0].Pattern != "github" {
@@ -131,7 +131,7 @@ func TestUsesConfigWithEnvVar(t *testing.T) {
 	configure("./testdata/testconfig.toml")
 
 	if config.Defaults.ColorScheme != "v1" ||
-		config.Users[0].Id != "example" ||
+		config.Users[0].ID != "example" ||
 		config.Users[0].Alias != "42" ||
 		config.Users[0].ColorScheme != "gh" ||
 		config.Users[0].Pattern != "github" {