diff --git a/cas_wrapper.py b/cas_wrapper.py
index e1e20a9..e5990a4 100644
--- a/cas_wrapper.py
+++ b/cas_wrapper.py
@@ -45,19 +45,32 @@ class CasWrapper:
         result_of_execution = command()
         return json.loads(result_of_execution)['hash']
 
-    def authenticate(self, local_git_repo_path: str) -> bool:
+    def authenticate(
+            self,
+            local_path: str,
+            metadata: dict = None,
+    ):
         """
         Wrapper around `cas authenticate`
-        :param local_git_repo_path: path to a local Git repo
+        :param local_path: path to a local Git repo
+               (should be started from `git://`)
+               or to a single local file
+        :param metadata: additional metadata
         :return: true if a commit is trusted, vice versa - false
         :rtype: bool
         """
         command = self._cas[
             'authenticate',
-            f'git://{local_git_repo_path}',
+            local_path,
             '-o',
             'json',
         ]
+        if metadata is not None:
+            for key, value in metadata.items():
+                command = command[
+                    '-a',
+                    f'{key}={value}',
+                ]
         try:
             result_of_execution = command()
         except ProcessExecutionError: