Clarify a few things in the comments

index/index.go

@@ -379,11 +379,13 @@ func indexAllFiles(opt *IndexOptions, dst, src string) error {
 	}
 	defer fileHandle.Close()
 
+	// Resolve the symbolic link
 	if fi, err := os.Stat(src); err == nil && fi.Mode()|os.ModeSymlink != 0 {
 		if s, err := os.Readlink(src); err == nil {
 			src = s
 		}
 	}
+
 	if err := filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
 		name := info.Name()
 		rel, err := filepath.Rel(src, path) //nolint

vcs/local.go

@@ -36,6 +36,8 @@ func newLocal(b []byte) (Driver, error) {
 }
 
 // Adapted from: https://github.com/golang/mod/blob/ad6fd61f94f8fdf6926f5dee6e45bdd13add2f9f/sumdb/dirhash/hash.go#L44
+// The original function returns a base64 encoded string and uses the (slower) SHA256 algorithm. For our purposes
+// SHA1 is good enough, since all we really need is a checksum to signal something changed
 func myHash(files []string, open func(string) (io.ReadCloser, error)) (string, error) {
 	h := sha1.New()
 	files = append([]string(nil), files...)