diff --git a/mcbackend/__init__.py b/mcbackend/__init__.py
index 47ddd63..96dceaf 100644
--- a/mcbackend/__init__.py
+++ b/mcbackend/__init__.py
@@ -13,3 +13,17 @@
     pass
 
 __version__ = "0.5.0"
+__all__ = [
+    "NumPyBackend",
+    "Backend",
+    "Chain",
+    "Run",
+    "ChainMeta",
+    "Coordinate",
+    "DataVariable",
+    "ExtendedValue",
+    "RunMeta",
+    "Variable",
+    "clickhouse",
+    "ClickHouseBackend",
+]