diff --git a/api/app/settings.py b/api/app/settings.py
index 4c42962..1411f14 100644
--- a/api/app/settings.py
+++ b/api/app/settings.py
@@ -19,8 +19,8 @@ class Settings(BaseSettings):
     index_path: str = 'index/lucene-index-cord19-paragraph'
     schema_path: str = 'schema/cord19.json'
     max_docs: int = 96
-    bm25_k1: float = 0.4
-    bm25_b: float = 0.9
+    bm25_k1: float = 0.9
+    bm25_b: float = 0.4
     rm3: bool = False
     rm3_fb_terms: int = 10
     rm3_fb_docs: int = 10