diff --git a/Cargo.lock b/Cargo.lock
index 13fbcf9ef..d6af0694a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,16 +84,6 @@ name = "base64"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "bigint"
-version = "0.1.0"
-dependencies = [
- "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "bit-set"
 version = "0.4.0"
@@ -304,6 +294,16 @@ dependencies = [
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ethcore-bigint"
+version = "0.1.0"
+dependencies = [
+ "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ethcore-dapps"
 version = "1.4.0"
@@ -516,11 +516,11 @@ version = "1.4.0"
 dependencies = [
  "ansi_term 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "bigint 0.1.0",
  "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
  "elastic-array 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "eth-secp256k1 0.5.4 (git+https://github.com/ethcore/rust-secp256k1)",
+ "ethcore-bigint 0.1.0",
  "ethcore-devtools 1.4.0",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -547,8 +547,8 @@ dependencies = [
 name = "ethcrypto"
 version = "0.1.0"
 dependencies = [
- "bigint 0.1.0",
  "eth-secp256k1 0.5.4 (git+https://github.com/ethcore/rust-secp256k1)",
+ "ethcore-bigint 0.1.0",
  "ethkey 0.2.0",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -569,9 +569,9 @@ dependencies = [
 name = "ethkey"
 version = "0.2.0"
 dependencies = [
- "bigint 0.1.0",
  "docopt 0.6.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "eth-secp256k1 0.5.4 (git+https://github.com/ethcore/rust-secp256k1)",
+ "ethcore-bigint 0.1.0",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1344,8 +1344,8 @@ dependencies = [
 name = "rlp"
 version = "0.1.0"
 dependencies = [
- "bigint 0.1.0",
  "elastic-array 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethcore-bigint 0.1.0",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/ethcrypto/Cargo.toml b/ethcrypto/Cargo.toml
index 85298266d..5c638b555 100644
--- a/ethcrypto/Cargo.toml
+++ b/ethcrypto/Cargo.toml
@@ -8,5 +8,5 @@ rust-crypto = "0.2.36"
 tiny-keccak = "1.0"
 eth-secp256k1 = { git = "https://github.com/ethcore/rust-secp256k1" }
 ethkey = { path = "../ethkey" }
-bigint = { path = "../util/bigint" }
+ethcore-bigint = { path = "../util/bigint" }
 
diff --git a/ethcrypto/src/lib.rs b/ethcrypto/src/lib.rs
index 9263e32c9..680718d12 100644
--- a/ethcrypto/src/lib.rs
+++ b/ethcrypto/src/lib.rs
@@ -16,7 +16,7 @@
 
 //! Crypto utils used ethstore and network.
 
-extern crate bigint;
+extern crate ethcore_bigint as bigint;
 extern crate tiny_keccak;
 extern crate crypto as rcrypto;
 extern crate secp256k1;
diff --git a/ethkey/Cargo.toml b/ethkey/Cargo.toml
index 6253d5a39..8e95d8519 100644
--- a/ethkey/Cargo.toml
+++ b/ethkey/Cargo.toml
@@ -10,7 +10,7 @@ tiny-keccak = "1.0"
 eth-secp256k1 = { git = "https://github.com/ethcore/rust-secp256k1" }
 rustc-serialize = "0.3"
 docopt = { version = "0.6", optional = true }
-bigint = { path = "../util/bigint" }
+ethcore-bigint = { path = "../util/bigint" }
 
 [features]
 default = []
diff --git a/ethkey/src/lib.rs b/ethkey/src/lib.rs
index 0bce090a5..1f345b2ff 100644
--- a/ethkey/src/lib.rs
+++ b/ethkey/src/lib.rs
@@ -20,7 +20,7 @@ extern crate lazy_static;
 extern crate tiny_keccak;
 extern crate secp256k1;
 extern crate rustc_serialize;
-extern crate bigint;
+extern crate ethcore_bigint as bigint;
 
 mod brain;
 mod error;
diff --git a/util/Cargo.toml b/util/Cargo.toml
index 106251a3f..45c5e6f8e 100644
--- a/util/Cargo.toml
+++ b/util/Cargo.toml
@@ -28,7 +28,7 @@ ethcore-devtools = { path = "../devtools" }
 libc = "0.2.7"
 vergen = "0.1"
 target_info = "0.1"
-bigint = { path = "bigint" }
+ethcore-bigint = { path = "bigint" }
 parking_lot = "0.2.6"
 using_queue = { path = "using_queue" }
 table = { path = "table" }
diff --git a/util/bigint/Cargo.toml b/util/bigint/Cargo.toml
index 68778e18c..ee25ce846 100644
--- a/util/bigint/Cargo.toml
+++ b/util/bigint/Cargo.toml
@@ -1,8 +1,9 @@
 [package]
-description = "Rust-assembler implementation of big integers arithmetic"
+description = "Large fixed-size integers and hash function outputs"
 homepage = "http://ethcore.io"
+repository = "https://github.com/ethcore/parity"
 license = "GPL-3.0"
-name = "bigint"
+name = "ethcore-bigint"
 version = "0.1.0"
 authors = ["Ethcore <admin@ethcore.io>"]
 build = "build.rs"
diff --git a/util/bigint/src/lib.rs b/util/bigint/src/lib.rs
index 746cc8139..307aed3ce 100644
--- a/util/bigint/src/lib.rs
+++ b/util/bigint/src/lib.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+//! Efficient large, fixed-size big integers and hashes.
+
 #![cfg_attr(asm_available, feature(asm))]
 
 extern crate rand;
diff --git a/util/bigint/src/uint.rs b/util/bigint/src/uint.rs
index c5dd033cb..dab00537e 100644
--- a/util/bigint/src/uint.rs
+++ b/util/bigint/src/uint.rs
@@ -30,11 +30,12 @@
 // If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
 //
 
-//! Big unsigned integer types
+//! Big unsigned integer types.
 //!
 //! Implementation of a various large-but-fixed sized unsigned integer types.
-//! The functions here are designed to be fast.
-//!
+//! The functions here are designed to be fast. There are optional `x86_64`
+//! implementations for even more speed, hidden behind the `x64_arithmetic`
+//! feature flag.
 
 use std::{mem, fmt};
 use std::str::{FromStr};
diff --git a/util/rlp/Cargo.toml b/util/rlp/Cargo.toml
index eba3a2842..c24e4cc59 100644
--- a/util/rlp/Cargo.toml
+++ b/util/rlp/Cargo.toml
@@ -7,6 +7,6 @@ authors = ["Ethcore <admin@ethcore.io>"]
 
 [dependencies]
 elastic-array = "0.5"
-bigint = { path = "../bigint" }
+ethcore-bigint = { path = "../bigint" }
 lazy_static = "0.2"
 rustc-serialize = "0.3"
\ No newline at end of file
diff --git a/util/rlp/src/lib.rs b/util/rlp/src/lib.rs
index 2cc8c3bd8..da5e816b5 100644
--- a/util/rlp/src/lib.rs
+++ b/util/rlp/src/lib.rs
@@ -65,7 +65,7 @@ pub use self::rlpin::{Rlp, RlpIterator};
 pub use self::rlpstream::RlpStream;
 pub use self::rlpcompression::RlpType;
 
-extern crate bigint;
+extern crate ethcore_bigint as bigint;
 extern crate elastic_array;
 extern crate rustc_serialize;
 
diff --git a/util/src/lib.rs b/util/src/lib.rs
index 57ea9c152..17c2f5151 100644
--- a/util/src/lib.rs
+++ b/util/src/lib.rs
@@ -99,7 +99,7 @@ extern crate time;
 extern crate ethcore_devtools as devtools;
 extern crate libc;
 extern crate target_info;
-extern crate bigint;
+extern crate ethcore_bigint as bigint;
 extern crate parking_lot;
 extern crate ansi_term;
 extern crate tiny_keccak;