diff --git a/env.example b/env.example
index 3fd824ba..828f962e 100644
--- a/env.example
+++ b/env.example
@@ -138,7 +138,7 @@ SUMMARY_LANGUAGE=English
 ### control the maximum chunk_ids stored in vector and graph db
 # MAX_SOURCE_IDS_PER_ENTITY=300
 # MAX_SOURCE_IDS_PER_RELATION=300
-### control chunk_ids limitation method: FIFO, FIFO
+### control chunk_ids limitation method: FIFO, KEEP
 ###    FIFO: First in first out
 ###    KEEP: Keep oldest (less merge action and faster)
 # SOURCE_IDS_LIMIT_METHOD=FIFO