diff --git a/mdb/backend.py b/mdb/backend.py
index ee2444a..3775788 100644
--- a/mdb/backend.py
+++ b/mdb/backend.py
@@ -2,6 +2,7 @@
 # details.
 
 from abc import ABC, abstractmethod
+from typing import List, Type
 
 
 class DebugBackend(ABC):
@@ -78,4 +79,4 @@ def float_regex(self) -> str:
         return r"\d+ = ([+-]?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?)"
 
 
-backends = [LLDBBackend, GDBBackend]
+backends: List[Type[DebugBackend]] = [LLDBBackend, GDBBackend]
diff --git a/mdb/mdb_wrapper.py b/mdb/mdb_wrapper.py
index 1bc9f63..8586c56 100644
--- a/mdb/mdb_wrapper.py
+++ b/mdb/mdb_wrapper.py
@@ -23,6 +23,7 @@
         "ranks": int,
         "select": str,
         "target": str,
+        "connection_attempts": int,
     },
 )