From 7bff8f6f50af598170df70fb4730264957cfdb60 Mon Sep 17 00:00:00 2001
From: Rob Rix <rob.rix@github.com>
Date: Wed, 14 Oct 2015 10:19:38 -0400
Subject: [PATCH] Document `Cofree.extract`.

---
 prototype/Doubt/Cofree.swift | 1 +
 1 file changed, 1 insertion(+)

diff --git a/prototype/Doubt/Cofree.swift b/prototype/Doubt/Cofree.swift
index 5e9b4876a..670f2eefe 100644
--- a/prototype/Doubt/Cofree.swift
+++ b/prototype/Doubt/Cofree.swift
@@ -29,6 +29,7 @@ extension Cofree {
 // MARK: - Comonad
 
 extension Cofree {
+	/// Returns the value annotating the syntax tree at this node.
 	public var extract: B {
 		switch self {
 		case let .Unroll(b, _):