docs: expand findURLs godoc

1 files changed, 4 insertions, 1 deletions

diff --git a/findurls.go b/findurls.go
index 6bc95d7..8f84936 100644
--- a/findurls.go
+++ b/findurls.go
@@ -9,7 +9,10 @@ import (
 )
 
 // findURLs combs htmlDoc for anchor-tag URLs. The refURL parameter is
-// used to resolve each found URL into an absolute URL.
+// used to resolve each found URL into an absolute URL, and also
+// ensures that we don't crawl outside refURL's parent Web domain.
+//
+// Return the slice of URLs.
 func findURLs(refURL url.URL, htmlDoc *html.Node) []url.URL {
 	// Used for collecting all the URLs we find.
 	var rawURLs []url.URL