diff --git a/transitions/experimental/decoration.py b/transitions/experimental/decoration.py
index bc305add..2a76e266 100644
--- a/transitions/experimental/decoration.py
+++ b/transitions/experimental/decoration.py
@@ -1,8 +1,3 @@
-from typing import Callable, ParamSpec
-
-P = ParamSpec("P")
-
-
-def expect_override(func: Callable[P, bool | None]) -> Callable[P, bool | None]:
+def expect_override(func):
     setattr(func, "expect_override", True)
     return func
diff --git a/transitions/experimental/decoration.pyi b/transitions/experimental/decoration.pyi
new file mode 100644
index 00000000..55945c60
--- /dev/null
+++ b/transitions/experimental/decoration.pyi
@@ -0,0 +1,6 @@
+from typing import Callable, ParamSpec
+
+P = ParamSpec("P")
+
+
+def expect_override(func: Callable[P, bool | None]) -> Callable[P, bool | None]: ...