diff --git a/stonesoup/proposal/__init__.py b/stonesoup/proposal/__init__.py
new file mode 100644
index 000000000..5e1a7f591
--- /dev/null
+++ b/stonesoup/proposal/__init__.py
@@ -0,0 +1,3 @@
+from .base import Proposal
+
+__all__ = ['Proposal']