add notes

frame/scheduler/src/lib.rs

@@ -28,6 +28,14 @@
 //! specified block number or at a specified period. These scheduled dispatches
 //! may be named or anonymous and may be canceled.
 //!
+//! **NOTE:** The scheduled calls will be dispatched with the default filter
+//! for the origin: namely `frame_system::Trait::BaseCallFilter` for all origin
+//! except root which will get no filter. And not the filter contained in origin
+//! use to call `fn schedule`.
+//!
+//! If a call is scheduled using proxy or whatever mecanism which adds filter,
+//! then those filter will not be used when dispatching the schedule call.
+//!
 //! ## Interface
 //!
 //! ### Dispatchable Functions