f docs

Author: TheBlueMatt

lightning-invoice/src/lib.rs

@@ -729,7 +729,8 @@ impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBui
 }
 
 impl<D: tb::Bool, H: tb::Bool, T: tb::Bool, C: tb::Bool, S: tb::Bool> InvoiceBuilder<D, H, T, C, S, tb::True> {
-	/// Sets the payment secret and relevant features.
+	/// Sets forwarding of payment metadata as required. A reader of the invoice which does not
+	/// support sending payment metadata will fail to read the invoice.
 	pub fn require_payment_metadata(mut self) -> InvoiceBuilder<D, H, T, C, S, tb::True> {
 		for field in self.tagged_fields.iter_mut() {
 			if let TaggedField::Features(f) = field {