diff --git a/host/basic_host.py b/host/basic_host.py
index 7f5fdef..b0c5a7d 100644
--- a/host/basic_host.py
+++ b/host/basic_host.py
@@ -1,4 +1,9 @@
 from host_interface import Host 
 
+# Upon host creation, host takes in options, 
+# including the list of addresses on which to listen.
+# Host then parses these options and delegates to its Network instance, 
+# telling it to listen on the given listen addresses.
+
 class BasicHost(Host):
 	pass
\ No newline at end of file
diff --git a/host/host_interface.py b/host/host_interface.py
index 367128c..ac53c23 100644
--- a/host/host_interface.py
+++ b/host/host_interface.py
@@ -33,17 +33,19 @@ class Host(ABC):
 		"""
 		set stream handler for host
 		:param protocol_id: protocol id used on stream
-		:param stream_handler: a stream handler instance
+		:param stream_handler: a stream handler function
 		:return: true if successful
 		"""
 		pass
 
+	# protocol_id can be a list of protocol_ids
+	# stream will decide which protocol_id to run on
 	@abstractmethod
-	def new_stream(self, context, peer_id, protocol_ids):
+	def new_stream(self, context, peer_id, protocol_id):
 		"""
 		:param context: a context instance
 		:param peer_id: peer_id that host is connecting
-		:param proto_ids: list of protocol ids that stream runs on
+		:param proto_id: protocol id that stream runs on
 		:return: true if successful
 		"""
 		pass
\ No newline at end of file
diff --git a/network/stream_interface.py b/network/stream_interface.py
index dc0a519..3d92d8e 100644
--- a/network/stream_interface.py
+++ b/network/stream_interface.py
@@ -36,3 +36,12 @@ class Stream(ABC):
 		:return: number of bytes written
 		"""
 		pass
+
+	@abstractmethod
+	def close():
+		"""
+		close stream
+		:return: true if successful
+		"""
+		pass
+