Documentation.

substrate/wasm-runtime/polkadot/src/codec/keyedvec.rs

@@ -1,6 +1,25 @@
+// Copyright 2017 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Polkadot is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Serialiser and prepender.
+
 use runtime_support::Vec;
 use slicable::Slicable;
 
+/// Trait to allow itselg to be serialised and prepended by a given slice.
 pub trait KeyedVec {
 	fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8>;
 }