doc

node/subsystem/src/lib.rs

@@ -286,6 +286,10 @@ pub trait SubsystemContext: Send + Sized + 'static {
 	///
 	/// This function should be used only when there is some other bounding factor on the messages
 	/// sent with it. Otherwise, it risks a memory leak.
+	///
+	/// Generally, for this method to be used, these conditions should be met:
+    /// * There is a communication cycle between subsystems
+    /// * One of the parts of the cycle has a clear bound on the number of messages produced.
 	fn send_unbounded_message(&mut self, msg: AllMessages) {
 		self.sender().send_unbounded_message(msg)
 	}