From 8775fe417280413f37f8a22377404d2c870d3e83 Mon Sep 17 00:00:00 2001
From: Kamal Marhubi <kamal@marhubi.com>
Date: Mon, 30 May 2016 16:10:26 +0200
Subject: [PATCH] codemap: Add module description

---
 src/codemap.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/codemap.rs b/src/codemap.rs
index 666bc67944d6..9ec5c6630640 100644
--- a/src/codemap.rs
+++ b/src/codemap.rs
@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+//! This module contains utilities that work with the `CodeMap` from libsyntax / syntex_syntax.
+//! This includes extension traits and methods for looking up spans and line ranges for AST nodes.
+
 use std::rc::Rc;
 
 use syntax::codemap::{BytePos, CodeMap, FileMap, Span};