diff --git a/codewiki/cli/models/config.py b/codewiki/cli/models/config.py
index 3f9e049..c714b2c 100644
--- a/codewiki/cli/models/config.py
+++ b/codewiki/cli/models/config.py
@@ -165,6 +165,7 @@ def to_dict(self) -> dict:
             'max_token_per_module': self.max_token_per_module,
             'max_token_per_leaf_module': self.max_token_per_leaf_module,
             'max_depth': self.max_depth,
+            'fallback_model': self.fallback_model,
         }
         if self.agent_instructions and not self.agent_instructions.is_empty():
             result['agent_instructions'] = self.agent_instructions.to_dict()