diff --git a/python-package/xgboost/core.py b/python-package/xgboost/core.py
index 8821123433c6..be1c1d2a0366 100644
--- a/python-package/xgboost/core.py
+++ b/python-package/xgboost/core.py
@@ -1844,7 +1844,6 @@ def __getitem__(self, val: Union[Integer, tuple, slice, EllipsisType]) -> "Boost
         if isinstance(val, tuple):
             raise ValueError("Only supports slicing through 1 dimension.")
         # All supported types are now slice
-        # FIXME(jiamingy): Use `types.EllipsisType` once Python 3.10 is used.
         if not isinstance(val, slice):
             msg = _expect((int, slice, np.integer, EllipsisType), type(val))
             raise TypeError(msg)