diff --git a/src/iminuit/cost.py b/src/iminuit/cost.py
index 76a75436..dee67d9f 100644
--- a/src/iminuit/cost.py
+++ b/src/iminuit/cost.py
@@ -131,6 +131,7 @@ class documentation for details.
     "ExtendedUnbinnedNLL",
     "Template",
     "LeastSquares",
+    "NormalConstraint",
 ]
 
 T = TypeVar("T", float, NDArray)