From 34f32661fd2b6baca1ce77f38798003bf187cffd Mon Sep 17 00:00:00 2001
From: Matt Baer <matt@flashstuf.com>
Date: Fri, 26 Feb 2016 13:58:06 -0500
Subject: [PATCH] Add comments

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

diff --git a/punctuation.go b/punctuation.go
index 275329d..ae7ec36 100644
--- a/punctuation.go
+++ b/punctuation.go
@@ -7,8 +7,11 @@ import (
 	"strings"
 )
 
+// valid characters to extract
 const validPunc = ";:'\",!?.-()"
 
+// Extract scans the given File and returns only typical punctuation used in
+// prose.
 func Extract(f *os.File) string {
 	var out string
 	in := bufio.NewScanner(f)