diff --git a/BallanceTasSonnet/Cargo.toml b/BallanceTasSonnet/Cargo.toml
index 76f2054..27e3bad 100644
--- a/BallanceTasSonnet/Cargo.toml
+++ b/BallanceTasSonnet/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [lib]
-name = "blctas"
+name = "_blctas"
 crate-type = ["cdylib"]
 
 [dependencies]
diff --git a/BallanceTasSonnet/DEVNOTES.md b/BallanceTasSonnet/DEVNOTES.md
index e69de29..5bb5f1b 100644
--- a/BallanceTasSonnet/DEVNOTES.md
+++ b/BallanceTasSonnet/DEVNOTES.md
@@ -0,0 +1,5 @@
+# Developer Notes
+
+## Build Environment Variables
+
+* `PYO3_PYTHON`: Point to your target Python executable. PyO3 will find proper header and library for linking because the layout of Python distribution is known.
diff --git a/BallanceTasSonnet/src/lib.rs b/BallanceTasSonnet/src/lib.rs
index 04c10af..ddef8af 100644
--- a/BallanceTasSonnet/src/lib.rs
+++ b/BallanceTasSonnet/src/lib.rs
@@ -2,7 +2,13 @@ use pyo3::prelude::*;
 
 pub(crate) mod wrapped;
 
-#[pymodule]
+#[pymodule(name = "_blctas")]
+mod blctas {
+    #[pymodule_export]
+    use super::tasfile;
+}
+
+#[pymodule(submodule)]
 mod tasfile {
     use pyo3::{exceptions::PyRuntimeError, prelude::*};
     use crate::wrapped::tasfile::{