diff --git a/doc/MODULE_MIGRATION.md b/doc/MODULE_MIGRATION.md
new file mode 100644
index 0000000..4d7b6bf
--- /dev/null
+++ b/doc/MODULE_MIGRATION.md
@@ -0,0 +1,5 @@
+# Migration of modules
+
+- bumblebee.util.which has been replaced with shutil.which
+- bumblebee.engine.Module has been replaced with core.module.Module
+