diff --git a/llmlingua/__init__.py b/llmlingua/__init__.py
index 5ed1ed4..b1fc6e0 100644
--- a/llmlingua/__init__.py
+++ b/llmlingua/__init__.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2023 Microsoft
+# Licensed under The MIT License [see LICENSE for details]
 # flake8: noqa
 from .prompt_compressor import PromptCompressor
 from .version import VERSION as __version__
diff --git a/llmlingua/prompt_compressor.py b/llmlingua/prompt_compressor.py
index 2ef4124..7fb8ccc 100644
--- a/llmlingua/prompt_compressor.py
+++ b/llmlingua/prompt_compressor.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2023 Microsoft
+# Licensed under The MIT License [see LICENSE for details]
+
 import bisect
 from collections import defaultdict
 from typing import List
diff --git a/llmlingua/version.py b/llmlingua/version.py
index c0b20f2..d0fa52b 100644
--- a/llmlingua/version.py
+++ b/llmlingua/version.py
@@ -1,8 +1,11 @@
+# Copyright (c) 2023 Microsoft
+# Licensed under The MIT License [see LICENSE for details]
+ 
 _MAJOR = "0"
 _MINOR = "1"
 # On master and in a nightly release the patch should be one ahead of the last
 # released build.
-_PATCH = "4"
+_PATCH = "5"
 # This is mainly for nightly builds which have the suffix ".dev$DATE". See
 # https://semver.org/#is-v123-a-semantic-version for the semantics.
 _SUFFIX = ""
diff --git a/setup.py b/setup.py
index 73c95d9..9be6c0e 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,6 @@
+# Copyright (c) 2023 Microsoft
+# Licensed under The MIT License [see LICENSE for details]
+ 
 from setuptools import find_packages, setup
 
 # PEP0440 compatible formatted version, see: