diff --git a/libpkpass/commands/arguments.py b/libpkpass/commands/arguments.py
index b5833d3..e08e587 100644
--- a/libpkpass/commands/arguments.py
+++ b/libpkpass/commands/arguments.py
@@ -272,4 +272,12 @@
             "help": "SC backend to use: opensc or yubi",
         },
     },
+    "PKCS11_module_path": {
+        "args": ["--PKCS11-module-path"],
+        "kwargs": {
+            "type": str,
+            "default": "/usr/local/lib/libykcs11.dylib",
+            "help": "Path to yubi PKCS11 module",
+        },
+    },
 }
diff --git a/libpkpass/commands/clip.py b/libpkpass/commands/clip.py
index 7be970e..c5dd02c 100644
--- a/libpkpass/commands/clip.py
+++ b/libpkpass/commands/clip.py
@@ -41,6 +41,7 @@ def _run_command_execution(self):
             passphrase=self.passphrase,
             card_slot=self.args["card_slot"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
         if not self.args["noverify"]:
             result = password.verify_entry(
diff --git a/libpkpass/commands/command.py b/libpkpass/commands/command.py
index 2a345bc..c00be19 100644
--- a/libpkpass/commands/command.py
+++ b/libpkpass/commands/command.py
@@ -163,6 +163,7 @@ def update_pass(self, pass_value):
             escrow_users=self.args["escrow_users"],
             minimum=self.args["min_escrow"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
         pass_entry["recipients"][self.args["identity"]] = swap_pass["recipients"][
             self.args["identity"]
@@ -199,6 +200,7 @@ def create_pass(self, password1, description, authorizer, recipient_list=None):
             escrow_users=self.args["escrow_users"],
             minimum=self.args["min_escrow"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
 
         password.write_password_data(
diff --git a/libpkpass/commands/distribute.py b/libpkpass/commands/distribute.py
index 4199688..1b1a2ea 100644
--- a/libpkpass/commands/distribute.py
+++ b/libpkpass/commands/distribute.py
@@ -51,6 +51,7 @@ def _run_command_execution(self):
                     passphrase=self.passphrase,
                     card_slot=self.args["card_slot"],
                     SCBackend=self.args["SCBackend"],
+                    PKCS11_module_path=self.args["PKCS11_module_path"],
                 )
                 password.add_recipients(
                     secret=plaintext_pw,
@@ -62,6 +63,7 @@ def _run_command_execution(self):
                     escrow_users=self.args["escrow_users"],
                     minimum=self.args["min_escrow"],
                     SCBackend=self.args["SCBackend"],
+                    PKCS11_module_path=self.args["PKCS11_module_path"],
                 )
 
                 password.write_password_data(dist_pass)
diff --git a/libpkpass/commands/export.py b/libpkpass/commands/export.py
index 67a48d1..3e747c2 100644
--- a/libpkpass/commands/export.py
+++ b/libpkpass/commands/export.py
@@ -48,6 +48,7 @@ def _iterate_pdb(self, passworddb, crypt_pass=False):
                 passphrase=self.passphrase,
                 card_slot=self.args["card_slot"],
                 SCBackend=self.args["SCBackend"],
+                PKCS11_module_path=self.args["PKCS11_module_path"],
             )
             password.recipients[uid]["encrypted_secret"] = plaintext_pw.encode("UTF-8")
             password.write_password_data(
diff --git a/libpkpass/commands/populate.py b/libpkpass/commands/populate.py
index 7f6f91d..ab5ac1c 100644
--- a/libpkpass/commands/populate.py
+++ b/libpkpass/commands/populate.py
@@ -177,6 +177,7 @@ def _decrypt_password_entry(self, password):
             passphrase=self.passphrase,
             card_slot=self.args["card_slot"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
         distributor = password.recipients[self.iddb.id["name"]]["distributor"]
         if not self.args["noverify"]:
diff --git a/libpkpass/commands/rename.py b/libpkpass/commands/rename.py
index 42ebea9..ef433ad 100644
--- a/libpkpass/commands/rename.py
+++ b/libpkpass/commands/rename.py
@@ -44,6 +44,7 @@ def _run_command_execution(self):
                     passphrase=self.passphrase,
                     card_slot=self.args["card_slot"],
                     SCBackend=self.args["SCBackend"],
+                    PKCS11_module_path=self.args["PKCS11_module_path"],
                 )
                 self._confirmation(plaintext_pw)
             else:
diff --git a/libpkpass/commands/show.py b/libpkpass/commands/show.py
index bf7aa83..5fc5c98 100644
--- a/libpkpass/commands/show.py
+++ b/libpkpass/commands/show.py
@@ -76,6 +76,7 @@ def _behalf_prep(self, password):
             passphrase=self.passphrase,
             card_slot=self.args["card_slot"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
         with open(temp_key, "w", encoding="ASCII") as fname:
             fname.write(
@@ -156,6 +157,7 @@ def _decrypt_password_entry(self, password, distributor):
             passphrase=self.passphrase,
             card_slot=self.args["card_slot"],
             SCBackend=self.args["SCBackend"],
+            PKCS11_module_path=self.args["PKCS11_module_path"],
         )
         dist_obj = (
             self.iddb.session.query(Recipient)
diff --git a/libpkpass/crypto.py b/libpkpass/crypto.py
index 662a87a..1f5bf39 100755
--- a/libpkpass/crypto.py
+++ b/libpkpass/crypto.py
@@ -17,6 +17,7 @@
     SignatureCreationError,
     X509CertificateError,
     BadBackendError,
+    PKPassError,
 )
 
 
@@ -96,9 +97,8 @@ def print_card_info(card_slot, identity, verbosity, color, theme_map, SCBackend)
             for out in out_list:
                 stripped = out.decode("UTF-8").strip()
                 if "Yubico" not in stripped:
-                    print("unsupported SC type")
-                    # todo: better handling
-                    exit(1)
+                    # exit(1)
+                    raise PKPassError("Unsupported SC type for backend yubi.\nYubico not in:\n" + stripped)
                 if int(stripped.split('CCID')[1] or 0) == int(card_slot):
                     verbosity = verbosity + 1 if verbosity < 2 else 2
                     stripped = "Using Slot" + ("\n").join(stripped.split("\n")[:verbosity])
@@ -120,7 +120,7 @@ def print_all_slots(slot_info, color, theme_map):
 
 
 def pk_decrypt_string(
-    ciphertext_string, ciphertext_derived_key, identity, passphrase, SCBackend="opensc", card_slot=None
+    ciphertext_string, ciphertext_derived_key, identity, passphrase, SCBackend="opensc", card_slot=None, PKCS11_module_path="/usr/local/lib/libykcs11.dylib"
 ):
     ####################################################################
     """Decrypt a base64 encoded string for the provided identity"""
@@ -161,7 +161,7 @@ def pk_decrypt_string(
                     raise DecryptionError(stdout) from err
                 returncode = proc.returncode
         elif SCBackend == "yubi":
-            # todo: fix this
+            # todo: this can be improved to not use temp files
             # https://developers.yubico.com/yubico-piv-tool/YKCS11/Supported_applications/openssl_engine.html
             with NamedTemporaryFile(delete=False) as fname:
                 fname.write(urlsafe_b64decode(ciphertext_derived_key))
@@ -175,8 +175,7 @@ def pk_decrypt_string(
                 "-pkeyopt", "rsa_padding_mode:pkcs1",
                 "-in", fname.name
             ]
-            # todo: make path an option
-            with Popen(command, stdout=PIPE, stdin=PIPE, stderr=STDOUT, env=dict(environ, PKCS11_MODULE_PATH="/usr/local/lib/libykcs11.dylib")) as proc:
+            with Popen(command, stdout=PIPE, stdin=PIPE, stderr=STDOUT, env=dict(environ, PKCS11_MODULE_PATH=PKCS11_module_path)) as proc:
                 stdout, _ = proc.communicate(
                     input=urlsafe_b64decode(ciphertext_derived_key)
                 )
@@ -198,7 +197,7 @@ def pk_decrypt_string(
     )
 
 
-def pk_sign_string(string, identity, passphrase, SCBackend="opensc", card_slot=None):
+def pk_sign_string(string, identity, passphrase, SCBackend="opensc", card_slot=None, PKCS11_module_path="/usr/local/lib/libykcs11.dylib"):
     ####################################################################
     """Compute the hash of string and create a digital signature"""
     ####################################################################
@@ -237,7 +236,7 @@ def pk_sign_string(string, identity, passphrase, SCBackend="opensc", card_slot=N
             with open(out.name, "rb") as sigfile:
                 signature = urlsafe_b64encode(handle_python_strings(sigfile.read()))
         elif SCBackend == "yubi":
-            # todo: fix this
+            # todo: this can be improved to not use temp files
             # https://developers.yubico.com/yubico-piv-tool/YKCS11/Supported_applications/openssl_engine.html
             with NamedTemporaryFile(delete=False) as fname:
                 fname.write(stringhash.encode("UTF-8"))
@@ -253,8 +252,7 @@ def pk_sign_string(string, identity, passphrase, SCBackend="opensc", card_slot=N
                     "-in", fname.name,
                     "-out", out.name
                 ]
-                # todo: make this an option
-                with Popen(command, stdout=PIPE, stdin=PIPE, stderr=STDOUT, env=dict(environ, PKCS11_MODULE_PATH="/usr/local/lib/libykcs11.dylib")) as proc:
+                with Popen(command, stdout=PIPE, stdin=PIPE, stderr=STDOUT, env=dict(environ, PKCS11_MODULE_PATH=PKCS11_module_path)) as proc:
                     stdout, _ = proc.communicate(
                         input=stringhash.encode("UTF-8")
                     )
@@ -442,7 +440,7 @@ def get_card_subjecthash(SCBackend, card_slot=None):
 
 def get_card_serial(card_slot=None):
     ####################################################################
-    """Return the serial element of a card"""
+    """Return the serial element of a yubico card"""
     ####################################################################
     command = ["yubico-piv-tool", "-a", "status"]
     if card_slot is not None and card_slot != 0:
@@ -454,7 +452,6 @@ def get_card_serial(card_slot=None):
     for line in stdout.decode("utf-8").strip().lower().splitlines():
         if "serial number:" in line:
             return line.split(":")[1].replace(" ", "").replace("\t", "")
-    # todo: fix this
     raise X509CertificateError("Smartcard not detected")
     return None
 
diff --git a/libpkpass/password.py b/libpkpass/password.py
index 3618ae9..2e31df8 100644
--- a/libpkpass/password.py
+++ b/libpkpass/password.py
@@ -84,6 +84,7 @@ def process_escrow_map(
         escrow_users=None,
         minimum=None,
         SCBackend="opensc",
+        PKCS11_module_path="/usr/local/lib/libykcs11.dylib",
     ):
         ####################################################################
         """Process the escrow user map into escrow users"""
@@ -104,6 +105,7 @@ def process_escrow_map(
                     passphrase,
                     card_slot,
                     SCBackend,
+                    PKCS11_module_path,
                 )
                 i += 1
 
@@ -125,6 +127,7 @@ def add_recipients(
         escrow_users=None,
         minimum=None,
         SCBackend="opensc",
+        PKCS11_module_path="/usr/local/lib/libykcs11.dylib",
     ):
         ####################################################################
         """Add recipients to the recipient list of this password object"""
@@ -142,6 +145,7 @@ def add_recipients(
                 passphrase=passphrase,
                 card_slot=card_slot,
                 SCBackend=SCBackend,
+                PKCS11_module_path=PKCS11_module_path,
             )
             for r in tqdm(recipients, leave=False)
         }
@@ -171,6 +175,7 @@ def add_recipients(
                     escrow_users=escrow_users,
                     minimum=minimum,
                     SCBackend=SCBackend,
+                    PKCS11_module_path=PKCS11_module_path,
                 )
             except ValueError as err:
                 print(f"Warning cannot create escrow shares, reason: {err}")
@@ -220,6 +225,7 @@ def _add_recipient(
         passphrase=None,
         card_slot=None,
         SCBackend="opensc",
+        PKCS11_module_path="/usr/local/lib/libykcs11.dylib",
     ):
         ####################################################################
         """Add recipient or sharer to list"""
@@ -242,6 +248,7 @@ def _add_recipient(
                 passphrase,
                 SCBackend,
                 card_slot,
+                PKCS11_module_path,
             )
 
             return recipient_entry
@@ -250,7 +257,7 @@ def _add_recipient(
                 f"Identity '{recipient}' is not on the recipient list for password '{self.metadata['name']}'"
             ) from err
 
-    def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBackend=None):
+    def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBackend=None, PKCS11_module_path="/usr/local/lib/libykcs11.dylib"):
         ####################################################################
         """Decrypt this password entry for a particular identity
         (usually the user)"""
@@ -271,6 +278,7 @@ def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBacken
                 passphrase,
                 SCBackend,
                 card_slot,
+                PKCS11_module_path,
             )
         except KeyError:
             try:
@@ -283,6 +291,8 @@ def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBacken
                             identity,
                             passphrase,
                             SCBackend,
+                            card_slot,
+                            PKCS11_module_path,
                         )
                 else:
                     cert_key = get_card_fingerprint(SCBackend, card_slot=card_slot)
@@ -295,9 +305,10 @@ def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBacken
                         passphrase,
                         SCBackend,
                         card_slot,
+                        PKCS11_module_path,
                     )
             except DecryptionError as err:
-                msg = create_error_message(recipient_entry["timestamp"], card_slot, SCBackend)
+                msg = create_error_message(recipient_entry["timestamp"], card_slot, SCBackend, err)
                 raise DecryptionError(
                     f"Error decrypting password named '{self.metadata['name']}'. {msg}"
                 ) from err
@@ -306,7 +317,7 @@ def decrypt_entry(self, identity=None, passphrase=None, card_slot=None, SCBacken
                     f"Error decrypting password named '{self.metadata['name']}'. Appropriate private key not found"
                 ) from err
         except DecryptionError as err:
-            msg = create_error_message(recipient_entry["timestamp"], card_slot, SCBackend)
+            msg = create_error_message(recipient_entry["timestamp"], card_slot, SCBackend, err)
             raise DecryptionError(
                 f"Error decrypting password named '{self.metadata['name']}'. {msg}"
             ) from err
@@ -402,16 +413,18 @@ def write_password_data(
             raise PasswordIOError(f"Error creating '{filename}'") from error
 
 
-def create_error_message(recipient_timestamp, card_slot, SCBackend="opensc"):
+def create_error_message(recipient_timestamp, card_slot, SCBackend="opensc", err=None):
     card_start = get_card_startdate(SCBackend)
     card_start = datetime.timestamp(parser.parse(card_start))
     distribute_time = float(recipient_timestamp)
     # Slots are indexed at 0 so when enumerating you add 1
-    # There is also an additional information line so add 1 again
-    if int(card_slot) + 2 > len(get_card_info(SCBackend)[0]):
+    # For opensc there is also an additional information line so add 1 again
+    if (int(card_slot) + 2 > len(get_card_info(SCBackend)[0]) and SCBackend == "opensc") or (int(card_slot) + 1 > len(get_card_info(SCBackend)[0]) and SCBackend == "yubi"):
         msg = "Attempting to use card slot that is not connected"
     elif distribute_time < card_start:
         msg = "Password distributed before this certificate was created"
+    elif err is not None and "dlopen" in str(err.msg):
+        msg = "Perhaps a bad path in PKCS11_module_path"
     else:
         msg = "Perhaps a bad pin/passphrase?"
     return msg
diff --git a/libpkpass/util.py b/libpkpass/util.py
index 2668e52..79e9cfe 100644
--- a/libpkpass/util.py
+++ b/libpkpass/util.py
@@ -190,6 +190,7 @@ def collect_args(parsedargs):
         "color": True,
         "verbosity": 0,
         "SCBackend": "opensc",
+        "PKCS11_module_path": "/usr/local/lib/libykcs11.dylib",
     }
     cli_args = parsedargs if isinstance(parsedargs, dict) else vars(parsedargs)
     config_args = get_config_args(cli_args["config"], cli_args)