diff --git a/env.example b/env.example
index bc162012..501035da 100644
--- a/env.example
+++ b/env.example
@@ -125,7 +125,7 @@ ENABLE_LLM_CACHE_FOR_EXTRACT=true
 SUMMARY_LANGUAGE=English
 
 ### Entity types that the LLM will attempt to recognize
-# ENTITY_TYPES='["Person", "Organization", "Location", "Event", "Artifact", "CreativeWork"]'
+# ENTITY_TYPES='["Person", "Organization", "Location", "Event", "Concept", "Artifact", "CreativeWork", "NaturalObject"]'
 
 ### Chunk size for document splitting, 500~1500 is recommended
 # CHUNK_SIZE=1200
diff --git a/lightrag/constants.py b/lightrag/constants.py
index b6d4f01c..3e2945d8 100644
--- a/lightrag/constants.py
+++ b/lightrag/constants.py
@@ -28,8 +28,10 @@ DEFAULT_ENTITY_TYPES = [
     "Organization",
     "Location",
     "Event",
+    "Concept",
     "Artifact",
     "CreativeWork",
+    "NaturalObject",
 ]
 
 # Separator for graph fields