diff --git a/frictionless/detector/detector.py b/frictionless/detector/detector.py
index 31b02b87e7..8722f69a10 100644
--- a/frictionless/detector/detector.py
+++ b/frictionless/detector/detector.py
@@ -453,7 +453,7 @@ def mapped_schema_fields_names(
         Args:
             fields (Union[List[None], List[Field]]): list of original
                                                         schema fields
-            case_sensitive (bool)
+            case_sensitive (bool): True if case sensitive, False else
 
         Returns:
             Dict[str, Optional[Field]]