docs: add package godoc

1 files changed, 2 insertions, 0 deletions

diff --git a/main.go b/main.go
index 7c2fe09..a3ee0cf 100644
--- a/main.go
+++ b/main.go
@@ -1,3 +1,5 @@
+// URLs implements a breadth-first search webcrawler based on the
+// example given in section 8.6 of The Go Programming Language.
 package main
 
 import (