diff --git a/cas_wrapper.py b/cas_wrapper.py
index 8e7b26a..976995a 100644
--- a/cas_wrapper.py
+++ b/cas_wrapper.py
@@ -108,6 +108,7 @@ class CasWrapper:
             local_path: str,
             return_json: bool = False,
             use_hash: bool = False,
+            signer_id: str = None,
     ):
         """
         Wrapper around `cas authenticate`
@@ -123,6 +124,8 @@ class CasWrapper:
         command_args = ['authenticate', local_path]
         if use_hash:
             command_args = ['authenticate', '--hash', local_path]
+        if signer_id:
+            command_args.extend(('--signerID', signer_id))
         command_args.extend(('-o', 'json'))
         command = self._cas[command_args]
         try:
@@ -146,6 +149,7 @@ class CasWrapper:
     def authenticate_source(
         self,
         local_path: str,
+        signer_id: str = None,
     ) -> typing.Tuple[bool, typing.Optional[str]]:
         """
         Authenticates source by git path.
@@ -155,7 +159,11 @@ class CasWrapper:
         commit_cas_hash = None
         self.ensure_login()
         try:
-            result_json = self.authenticate(local_path, return_json=True)
+            result_json = self.authenticate(
+                local_path,
+                return_json=True,
+                signer_id=signer_id
+            )
             is_authenticated = result_json['verified']
             commit_cas_hash = result_json['hash']
         # we can fall with ProcessExecutionError,
@@ -168,6 +176,7 @@ class CasWrapper:
         self,
         local_path: str,
         use_hash: bool = False,
+        signer_id: str = None,
     ) -> bool:
         """
         Authenticates artifact by artifact path or hash if `use_hash` is True.
@@ -180,6 +189,7 @@ class CasWrapper:
                 local_path,
                 use_hash=use_hash,
                 return_json=True,
+                signer_id=signer_id
             )['verified']
         # we can fall with ProcessExecutionError,
         # because artifact can be not notarized