diff --git a/stubs/rx/internal/concurrency.pyi b/stubs/rx/internal/concurrency.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rx/internal/concurrency.pyi
@@ -0,0 +1,23 @@
+# Stubs for rx.internal.concurrency (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+
+class RLock:
+    def locked(self): ...
+    def __enter__(self) -> None: ...
+    def __exit__(self, type: Any, value: Any, traceback: Any) -> None: ...
+
+class Event:
+    def is_set(self): ...
+    def set(self) -> None: ...
+    def clear(self) -> None: ...
+    def wait(self) -> None: ...
+
+class Condition:
+    def wait(self) -> None: ...
+    def aquire(self) -> None: ...
+    def release(self) -> None: ...
+    def notify(self, n: int = ...) -> None: ...
+    def notify_all(self) -> None: ...