diff --git a/bin/diffutils/main.rs b/bin/diffutils/main.rs
index e083b28..39b97a3 100644
--- a/bin/diffutils/main.rs
+++ b/bin/diffutils/main.rs
@@ -1,3 +1,8 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
 use crate::params::*;
 use std::env;
 
diff --git a/lib/context-diff/src/lib.rs b/lib/context-diff/src/lib.rs
index 033e8aa..b6348d4 100644
--- a/lib/context-diff/src/lib.rs
+++ b/lib/context-diff/src/lib.rs
@@ -1,3 +1,8 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
 use std::collections::VecDeque;
 use std::io::Write;
 
diff --git a/lib/ed-diff/src/lib.rs b/lib/ed-diff/src/lib.rs
index bc59e51..5b686bf 100644
--- a/lib/ed-diff/src/lib.rs
+++ b/lib/ed-diff/src/lib.rs
@@ -1,3 +1,8 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
 use std::io::Write;
 
 #[derive(Debug, PartialEq)]
diff --git a/lib/normal-diff/src/lib.rs b/lib/normal-diff/src/lib.rs
index f5d7cab..01d1a72 100644
--- a/lib/normal-diff/src/lib.rs
+++ b/lib/normal-diff/src/lib.rs
@@ -1,3 +1,8 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
 use std::io::Write;
 
 #[derive(Debug, PartialEq)]
diff --git a/lib/unified-diff/src/lib.rs b/lib/unified-diff/src/lib.rs
index 0caecf5..9939134 100644
--- a/lib/unified-diff/src/lib.rs
+++ b/lib/unified-diff/src/lib.rs
@@ -1,3 +1,8 @@
+// This file is part of the uutils diffutils package.
+//
+// For the full copyright and license information, please view the LICENSE-*
+// files that was distributed with this source code.
+
 use std::collections::VecDeque;
 use std::io::Write;