diff --git a/src/lib.rs b/src/lib.rs
index 3c050d7..49b6578 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,9 +6,16 @@
 //!    [`types`], filling missing parameters. See [`converter`].
 //! 2. Generate [`proc_macro2::TokenStream`] from register map produced in the previous step. See
 //!    [`generator`].
+//!
+//! # modules
+//! - [`types`]: type definitions of internal register map representation
+//! - [`type_traits`]: supplemental traits for types in [`types`]
+//! - [`parser`]: supplemental parser (string to custom types)
+//! - [`converter`]: DOM to internal representation
+//! - [`generator`]: internal representation to rust code
 
-pub mod types;
-pub mod type_traits;
-pub mod parser;
 pub mod converter;
 pub mod generator;
+pub mod parser;
+pub mod type_traits;
+pub mod types;
diff --git a/src/parser.rs b/src/parser.rs
index 4924fd7..87e86f9 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,5 +1,5 @@
 //! Module for converting XML custom token string to rust types.
-//! 
+//!
 //! Unlike, [`crate::converter`], this only has string "parser".
 
 use std::any;