From bc48c2be47ed4994d23327980737fef441fbbcc8 Mon Sep 17 00:00:00 2001
From: Frans Kaashoek <kaashoek@mit.edu>
Date: Mon, 22 Aug 2022 20:44:02 -0400
Subject: [PATCH] Add ref to this nice page about Chapter 9's regexp matcher

---
 user/grep.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/user/grep.c b/user/grep.c
index 19882b9..2315a0c 100644
--- a/user/grep.c
+++ b/user/grep.c
@@ -62,7 +62,8 @@ main(int argc, char *argv[])
 }
 
 // Regexp matcher from Kernighan & Pike,
-// The Practice of Programming, Chapter 9.
+// The Practice of Programming, Chapter 9, or
+// https://www.cs.princeton.edu/courses/archive/spr09/cos333/beautiful.html
 
 int matchhere(char*, char*);
 int matchstar(int, char*, char*);