diff --git a/core/module/digital_twin_graph/src/digital_twin_graph_config.rs b/core/module/digital_twin_graph/src/digital_twin_graph_config.rs
index 6abc51b6..3ce9f3f5 100644
--- a/core/module/digital_twin_graph/src/digital_twin_graph_config.rs
+++ b/core/module/digital_twin_graph/src/digital_twin_graph_config.rs
@@ -7,17 +7,28 @@ use serde_derive::Deserialize;
 
 const DEFAULT_CONFIG_FILENAME: &str = "digital_twin_graph_settings";
 
+/// The settings for the digital twin graph service.
 #[derive(Debug, Deserialize)]
 pub struct Settings {
+    /// The authority (address + optional port in the format "<address>[:<port>]") for the Ibeji application server.
     pub base_authority: String,
 }
 
 /// Load the settings.
+/// The settings are loaded from the default config file name.
+/// 
+/// # Returns
+/// The settings.
 pub fn load_settings() -> Settings {
     utils::load_settings(DEFAULT_CONFIG_FILENAME).unwrap()
 }
 
-/// Load the settings.
+/// Load the settings with the specified config file name.
+///
+/// # Arguments
+/// * `config_filename` - The name of the config file.
+/// # Returns
+/// The settings.
 pub fn load_settings_with_config_filename(config_filename: &str) -> Settings {
     utils::load_settings(config_filename).unwrap()
 }