diff --git a/README.rst b/README.rst
index 5e61711..812afee 100644
--- a/README.rst
+++ b/README.rst
@@ -17,11 +17,11 @@ Quick Start
 Installation
 ------------
 
-To install OSDP, use `pip <https://pip.pypa.io/en/stable/quickstart/>`_ or `pipenv <https://docs.pipenv.org/en/latest/>`_:
+To install OSDP, use `pip3 <https://pip.pypa.io/en/stable/quickstart/>`_ or `pipenv <https://docs.pipenv.org/en/latest/>`_:
 
 .. code-block:: console
 
-    $ pip install -U osdp
+    $ pip3 install -U osdp
 
 This module depends on
 
diff --git a/osdp/_types.py b/osdp/_types.py
index 93949d3..3e15db7 100644
--- a/osdp/_types.py
+++ b/osdp/_types.py
@@ -260,7 +260,7 @@ def parse_data(reply):
 		return LocalStatus(tamper, power_failure)
 
 	def __repr__(self):
-		return "       Tamper: {0}\nCPower Failure: {1}".format(self.tamper, self.power_failure)
+		return "        Tamper: {0}\nCPower Failure: {1}".format(self.tamper, self.power_failure)
 
 
 class ReaderTamperStatus(Enum):
@@ -482,7 +482,7 @@ def __init__(self, reader_number: int, format_code: FormatCode, bit_count: int,
 		self.data = data
 
 	@staticmethod
-	def parse_data(reply) -> Nak:
+	def parse_data(reply):
 		data = reply.extract_reply_data
 		if len(data) < 4:
 			raise ValueError("Invalid size for the data")
@@ -514,7 +514,7 @@ def __init__(self, reader_number: int, bit_count: int, data: bytes):
 		self.data = data
 
 	@staticmethod
-	def parse_data(reply) -> Nak:
+	def parse_data(reply):
 		data = reply.extract_reply_data
 		if len(data) < 2:
 			raise ValueError("Invalid size for the data")