diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 5c3581a..e879121 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,17 +1,5 @@
 # Frequenz Microgrid Component Graph Library Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
-## Upgrading
-
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
+- It is now possible to create subclasses of the `ComponentGraph` and `ComponentGraphConfig` classes from python.
diff --git a/src/graph.rs b/src/graph.rs
index 488d10b..f0811c5 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -16,7 +16,7 @@ use pyo3::{
     types::{PyAny, PySet, PyType},
 };
 
-#[pyclass]
+#[pyclass(subclass)]
 #[derive(Clone, Default, Debug)]
 pub struct ComponentGraphConfig {
     config: cg::ComponentGraphConfig,
@@ -49,7 +49,7 @@ impl ComponentGraphConfig {
     }
 }
 
-#[pyclass]
+#[pyclass(subclass)]
 pub struct ComponentGraph {
     graph: cg::ComponentGraph<Component, Connection>,
 }