diff --git a/src/lib.rs b/src/lib.rs
index f0fc571..4afd9d0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 // #![doc = include_str!("../README.md")]
+// uncomment the above line to include the README.md file in the documentation
 
 //! # msyrs
 //!
@@ -18,6 +19,9 @@
 /// Documentation and type-stubs for the `msyrs` Python API.
 pub mod _py;
 
+/// Implementation for the `core` module.
+pub mod core;
+
 /// Implementation for the `download` module.
 pub mod download;