diff --git a/util/src/common.rs b/util/src/common.rs
index 0f10a4e97..9cf7a3765 100644
--- a/util/src/common.rs
+++ b/util/src/common.rs
@@ -1,3 +1,5 @@
+//! Utils common types and macros global reexport.
+
 pub use standard::*;
 pub use from_json::*;
 pub use error::*;
diff --git a/util/src/from_json.rs b/util/src/from_json.rs
index 1d95df691..7319ec8aa 100644
--- a/util/src/from_json.rs
+++ b/util/src/from_json.rs
@@ -1,3 +1,5 @@
+//! Coversion from json.
+
 use standard::*;
 
 #[macro_export]
diff --git a/util/src/lib.rs b/util/src/lib.rs
index 64cbac662..f422db7c8 100644
--- a/util/src/lib.rs
+++ b/util/src/lib.rs
@@ -82,13 +82,10 @@ extern crate serde;
 #[macro_use]
 extern crate log as rlog;
 
-/// TODO [Gav Wood] Please document me
 pub mod standard;
 #[macro_use]
-/// TODO [Gav Wood] Please document me
 pub mod from_json;
 #[macro_use]
-/// TODO [Gav Wood] Please document me
 pub mod common;
 pub mod error;
 pub mod hash;
diff --git a/util/src/standard.rs b/util/src/standard.rs
index 873df6cb4..d1589d30a 100644
--- a/util/src/standard.rs
+++ b/util/src/standard.rs
@@ -1,3 +1,5 @@
+//! Std lib global reexports.
+
 pub use std::io;
 pub use std::fs;
 pub use std::str;