diff --git a/ethcore/src/lib.rs b/ethcore/src/lib.rs
index 9985dc58e..cd32da999 100644
--- a/ethcore/src/lib.rs
+++ b/ethcore/src/lib.rs
@@ -136,6 +136,7 @@ pub mod miner;
 pub mod snapshot;
 pub mod action_params;
 pub mod db;
+pub mod light;
 #[macro_use] pub mod evm;
 
 mod cache_manager;
diff --git a/ethcore/src/light/client.rs b/ethcore/src/light/client.rs
index 18635aa44..a4ff2531f 100644
--- a/ethcore/src/light/client.rs
+++ b/ethcore/src/light/client.rs
@@ -34,7 +34,7 @@ use io::IoChannel;
 use util::hash::H256;
 use util::Bytes;
 
-/// A light client.
+/// Light client implementation.
 pub struct Client {
 	engine: Arc<Engine>,
 	header_queue: HeaderQueue,
@@ -68,4 +68,34 @@ impl Client {
 	pub fn queue_info(&self) -> QueueInfo {
 		self.header_queue.queue_info()
 	}
+}
+
+impl Provider for Client {
+	fn block_headers(&self, block: H256, skip: usize, max: usize, reverse: bool) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn block_bodies(&self, blocks: Vec<H256>) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn receipts(&self, blocks: Vec<H256>) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn proofs(&self, requests: Vec<(H256, ProofRequest)>) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn code(&self, accounts: Vec<(H256, H256)>) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn header_proofs(&self, requests: Vec<CHTProofRequest>) -> Vec<Bytes> {
+		Vec::new()
+	}
+
+	fn pending_transactions(&self) -> Vec<SignedTransaction> {
+		Vec::new()
+	}
 }
\ No newline at end of file
diff --git a/ethcore/src/light/mod.rs b/ethcore/src/light/mod.rs
index 22b446074..863f35433 100644
--- a/ethcore/src/light/mod.rs
+++ b/ethcore/src/light/mod.rs
@@ -1,3 +1,19 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
 //! Light client logic and implementation.
 //!
 //! A "light" client stores very little chain-related data locally
@@ -12,8 +28,9 @@
 //! It starts by performing a header-only sync, verifying every header in
 //! the chain.
 
-mod provider;
 mod client;
+mod provider;
+mod sync;
 
 pub use self::client::Client;
-pub use self::provider::{CHTProofRequest, ProofRequest, Provider};
+pub use self::provider::{CHTProofRequest, ProofRequest, Provider};
\ No newline at end of file
diff --git a/ethcore/src/light/provider.rs b/ethcore/src/light/provider.rs
index 4833184eb..05859c78b 100644
--- a/ethcore/src/light/provider.rs
+++ b/ethcore/src/light/provider.rs
@@ -19,12 +19,15 @@
 
 pub use proof_request::{CHTProofRequest, ProofRequest};
 
+use transaction::SignedTransaction;
+
 use util::Bytes;
 use util::hash::H256;
 
 /// Defines the operations that a provider for `LES` must fulfill.
 ///
 /// These are defined at [1], but may be subject to change.
+/// Requests which can't be fulfilled should return an empty RLP list.
 ///
 /// [1]: https://github.com/ethcore/parity/wiki/Light-Ethereum-Subprotocol-(LES)
 pub trait Provider {
@@ -54,4 +57,7 @@ pub trait Provider {
 
 	/// Provide header proofs from the Canonical Hash Tries.
 	fn header_proofs(&self, requests: Vec<CHTProofRequest>) -> Vec<Bytes>;
+
+	/// Provide pending transactions.
+	fn pending_transactions(&self) -> Vec<SignedTransaction>;
 }
\ No newline at end of file