diff --git a/lightrag/__init__.py b/lightrag/__init__.py
index 2d660928..e4cb3e63 100644
--- a/lightrag/__init__.py
+++ b/lightrag/__init__.py
@@ -1,5 +1,5 @@
 from .lightrag import LightRAG as LightRAG, QueryParam as QueryParam
 
-__version__ = "1.2.3"
+__version__ = "1.2.4"
 __author__ = "Zirui Guo"
 __url__ = "https://github.com/HKUDS/LightRAG"
diff --git a/lightrag/lightrag.py b/lightrag/lightrag.py
index 6f42003d..a36934e8 100644
--- a/lightrag/lightrag.py
+++ b/lightrag/lightrag.py
@@ -36,7 +36,7 @@ from .operate import (
     mix_kg_vector_query,
     naive_query,
 )
-from .prompt import GRAPH_FIELD_SEP
+from .prompt import GRAPH_FIELD_SEP, PROMPTS
 from .utils import (
     EmbeddingFunc,
     always_get_an_event_loop,
@@ -236,7 +236,11 @@ class LightRAG:
     max_parallel_insert: int = field(default=int(os.getenv("MAX_PARALLEL_INSERT", 20)))
     """Maximum number of parallel insert operations."""
 
-    addon_params: dict[str, Any] = field(default_factory=dict)
+    addon_params: dict[str, Any] = field(
+        default_factory=lambda: {
+            "language": os.getenv("SUMMARY_LANGUAGE", PROMPTS["DEFAULT_LANGUAGE"])
+        }
+    )
 
     # Storages Management
     # ---