diff --git a/rag.py b/rag.py
index 7ab2bc0..d97f50a 100644
--- a/rag.py
+++ b/rag.py
@@ -35,9 +35,9 @@ def split(text: str):
     return out
 
 # ------------------- charger meta et reconstruire passages ------------------
-meta_path = Path("corpus.meta.json")
+meta_path = Path("chap.meta.json")
 if not meta_path.exists():
-    raise SystemExit("corpus.meta.json introuvable – lancez d'abord index.py")
+    raise SystemExit("chap.meta.json introuvable – lancez d'abord index.py")
 meta = json.load(meta_path.open())
 
 # mapping (file, part) -> chunk text