diff --git a/servlet/config.go b/servlet/config.go
index 37f47a2..8474212 100644
--- a/servlet/config.go
+++ b/servlet/config.go
@@ -9,6 +9,20 @@ import (
 )
 
 type (
+	// ConfigType is an enum representing the types of configuration routes.
+	// There are currently 3 options:
+	//
+	//	Text - Used for simple text/HTML routes.
+	//	Image - Used for image file routes.
+	//	SingleFile - Used for serving a single file.
+	//
+	// These constants define the allowed values for the ConfigType
+	// field used when loading route configurations from a JSON file.
+	//
+	//
+	// So when loading a JSON config, the "ConfigType" field must be
+	// set to one of these constant values like "Text" or "Image".
+
 	ConfigType string
 
 	// ConfigEntry defines a single route configuration entry.
@@ -35,16 +49,33 @@ type (
 )
 
 const (
+	// defaultTemplateFileName is the default file name for the generated
+	// blank config template.
 	defaultTemplateFileName = "servlet.json.example.tmpl"
-	defaultListeningPort    = ":8080"
-	defaultUrlPattern       = "/*"
-	defaultFileLocation     = "errors/"
+
+	// defaultListeningPort is the default HTTP listening port.
+	// Set to ":8080" to listen on port 8080.
+	defaultListeningPort = ":8080"
+
+	// defaultUrlPattern is the default URL pattern route.
+	// Set to "/*" to match all URLs.
+	defaultUrlPattern = "/*"
+
+	// defaultFileLocation is the default file location to serve static files from.
+	// Set to "errors/" to serve from a directory called "errors".
+	defaultFileLocation = "errors/"
 )
 
 const (
-	Text       ConfigType = "Text"
-	Image                 = "Image"
-	SingleFile            = "SingleFile"
+	// Text is a ConfigType constant representing a text/HTML route.
+	Text ConfigType = "Text"
+
+	// Image is a ConfigType constant representing an image file route.
+	Image = "Image"
+
+	// SingleFile is a ConfigType constant representing a route that
+	// serves a single file.
+	SingleFile = "SingleFile"
 )
 
 func CreateBlankConfig() *Config {