diff --git a/src/primaite/acl/access_control_list.py b/src/primaite/acl/access_control_list.py
index f5f70d6c..78ea8a36 100644
--- a/src/primaite/acl/access_control_list.py
+++ b/src/primaite/acl/access_control_list.py
@@ -34,7 +34,7 @@ class AccessControlList:
         else:
             return False
 
-    def is_blocked(self, _source_ip_address, _dest_ip_address, _protocol, _port):
+    def is_blocked(self, _source_ip_address: str, _dest_ip_address: str, _protocol: str, _port: str) -> bool:
         """
         Checks for rules that block a protocol / port.
 
diff --git a/src/primaite/agents/hardcoded_acl.py b/src/primaite/agents/hardcoded_acl.py
index a724e10e..f8c571c9 100644
--- a/src/primaite/agents/hardcoded_acl.py
+++ b/src/primaite/agents/hardcoded_acl.py
@@ -78,7 +78,6 @@ class HardCodedACLAgent(HardCodedAgentSessionABC):
         dest_node_address = nodes[dest_node_id].ip_address
         protocol = ier.get_protocol()  # e.g. 'TCP'
         port = ier.get_port()
-        # I can't find where this function 'get_relevant_rules' is defined...
         matching_rules = acl.get_relevant_rules(source_node_address, dest_node_address, protocol, port)
         return matching_rules