diff --git a/aider/io.py b/aider/io.py
index ffb364e23..50053a602 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -69,6 +69,11 @@ def restore_multiline(func):
     return wrapper
 
 
+class CommandCompletionException(Exception):
+    """Raised when a command should use the normal autocompleter instead of command-specific completion."""
+    pass
+
+
 @dataclass
 class ConfirmGroup:
     preference: str = None