diff --git a/surfsense_backend/app/schemas/documents.py b/surfsense_backend/app/schemas/documents.py
index 49d2836b2..162dd6882 100644
--- a/surfsense_backend/app/schemas/documents.py
+++ b/surfsense_backend/app/schemas/documents.py
@@ -73,6 +73,10 @@ class DocumentWithChunksRead(DocumentRead):
     chunks: list[ChunkRead] = []
     total_chunks: int = 0
     chunk_start_index: int = 0
+    # 1-based inclusive line range of the cited chunk within source_markdown;
+    # None when the chunk predates char spans or the body is unavailable.
+    cited_start_line: int | None = None
+    cited_end_line: int | None = None
 
     model_config = ConfigDict(from_attributes=True)