diff --git a/src/msyrs.pyi b/src/msyrs.pyi
index 1b806b0..0c8e2c2 100644
--- a/src/msyrs.pyi
+++ b/src/msyrs.pyi
@@ -32,3 +32,9 @@ class qdf:
     def update_dataframe(*args, **kwargs) -> DataFrame: ...
     @staticmethod
     def pivot_dataframe_by_ticker(*args, **kwargs) -> DataFrame: ...
+
+class panel:
+    __all__ = ["historic_vol"]
+
+    @staticmethod
+    def historic_vol(*args, **kwargs) -> DataFrame: ...