Update src/lib.rs

Co-authored-by: Ralf Jung <[email protected]>

src/lib.rs

@@ -87,6 +87,7 @@ fn make_writeable(p: &Path) -> Result<()> {
 
 /// Hash the metadata and size of every file in a directory, recursively.
 pub fn hash_recursive(path: &Path, hasher: &mut DefaultHasher) -> Result<()> {
+    // We sort the entries to ensure a stable hash.
     for entry in WalkDir::new(path)
         .follow_links(true)
         .sort_by_file_name()