From 8b9faefd92a7eace5d885689804bd9f13aeda56c Mon Sep 17 00:00:00 2001
From: Asim <asim@chuhnk.me>
Date: Sat, 30 Jan 2016 21:17:44 +0000
Subject: [PATCH] Add metadata comment

---
 metadata/metadata.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/metadata/metadata.go b/metadata/metadata.go
index 530e6014..393e0853 100644
--- a/metadata/metadata.go
+++ b/metadata/metadata.go
@@ -6,6 +6,9 @@ import (
 
 type metaKey struct{}
 
+// Metadata is our way of representing request headers internally.
+// They're used at the RPC level and translate back and forth
+// from Transport headers.
 type Metadata map[string]string
 
 func FromContext(ctx context.Context) (Metadata, bool) {