diff --git a/mdrsclient/__init__.py b/mdrsclient/__init__.py
index e69de29..9835614 100644
--- a/mdrsclient/__init__.py
+++ b/mdrsclient/__init__.py
@@ -0,0 +1,3 @@
+from mdrsclient.__version__ import __version__
+
+__all__ = ["__version__"]
diff --git a/mdrsclient/__main__.py b/mdrsclient/__main__.py
index 6a1c317..ee712ce 100644
--- a/mdrsclient/__main__.py
+++ b/mdrsclient/__main__.py
@@ -21,7 +21,7 @@ from mdrsclient.exceptions import MDRSException
 
 
 def main() -> None:
-    description = """This is a command-line program to up files."""
+    description = """This is a command-line program for up- and downloading files to and from MDRS based repository."""
 
     parser = argparse.ArgumentParser(description=description, formatter_class=argparse.RawDescriptionHelpFormatter)
     parsers = parser.add_subparsers(title="subcommands")
diff --git a/mdrsclient/connection.py b/mdrsclient/connection.py
index bd1648f..79ece4d 100644
--- a/mdrsclient/connection.py
+++ b/mdrsclient/connection.py
@@ -1,7 +1,9 @@
+import platform
 import threading
 
 from requests import Response, Session
 
+from mdrsclient.__version__ import __version__
 from mdrsclient.cache import CacheFile
 from mdrsclient.exceptions import MissingConfigurationException
 from mdrsclient.models import Laboratories, Token, User
@@ -74,6 +76,11 @@ class MDRSConnection:
         return "/".join(parts)
 
     def __prepare_headers(self) -> None:
-        self.session.headers.update({"accept": "application/json"})
+        self.session.headers.update(
+            {
+                "User-Agent": f"MdrsClient/{__version__} (Python {platform.python_version()} - {platform.platform()})",
+                "Accept": "application/json",
+            }
+        )
         if self.token is not None:
             self.session.headers.update({"Authorization": f"Bearer {self.token.access}"})
diff --git a/mdrsclient/utils.py b/mdrsclient/utils.py
index 97c066a..a002d30 100644
--- a/mdrsclient/utils.py
+++ b/mdrsclient/utils.py
@@ -20,5 +20,5 @@ class FileLock:
     def unlock(file: IO[Any]) -> None:
         if os.name == "nt":
             msvcrt.locking(file.fileno(), msvcrt.LK_UNLCK, 1)
-        else:
+        elif os.name == "posix":
             fcntl.flock(file.fileno(), fcntl.LOCK_UN)