Document modules

error.rs

@@ -1,7 +1,9 @@
+//! Postgres errors
 
 macro_rules! make_errors(
     ($($code:pat => $error:ident),+) => (
         // TODO: Get rid of this module when mozilla/rust#4375 is fixed
+        /// A module to get around issues with macro expansion
         pub mod hack {
             /// SQLSTATE error codes
             #[deriving(ToStr, Eq)]

pool.rs

@@ -1,3 +1,5 @@
+//! A simple connection pool
+
 extern mod extra;
 
 use extra::arc::MutexArc;

types.rs

@@ -1,3 +1,5 @@
+//! Traits dealing with Postgres data types
+
 extern mod extra;
 
 use extra::time::Timespec;