diff --git a/stubs/rx/joins/joinobserver.pyi b/stubs/rx/joins/joinobserver.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rx/joins/joinobserver.pyi
@@ -0,0 +1,19 @@
+# Stubs for rx.joins.joinobserver (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from rx.core import ObserverBase
+from typing import Any
+
+class JoinObserver(ObserverBase):
+    source: Any = ...
+    on_error: Any = ...
+    queue: Any = ...
+    active_plans: Any = ...
+    subscription: Any = ...
+    is_disposed: bool = ...
+    def __init__(self, source: Any, on_error: Any) -> None: ...
+    def add_active_plan(self, active_plan: Any) -> None: ...
+    def subscribe(self) -> None: ...
+    def remove_active_plan(self, active_plan: Any) -> None: ...
+    def dispose(self) -> None: ...