diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 50551548..e2466614 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -40,7 +40,7 @@ Change Log
 - [FIXED] the "BaseBackendTest" class did not correctly detect divergence in most cases (which lead 
   to weird bugs in failing tests)
 - [ADDED] A type of environment that does not perform the "emulation of the protections"
-  for some part of the grid (`MaskedEnvironment`)
+  for some part of the grid (`MaskedEnvironment`) see https://github.com/rte-france/Grid2Op/issues/571
 - [IMPROVED] the CI speed: by not testing every possible numpy version but only most ancient and most recent
 - [IMPROVED] Runner now test grid2op version 1.9.6 and 1.9.7
 - [IMPROVED] refacto `gridobj_cls._clear_class_attribute` and `gridobj_cls._clear_grid_dependant_class_attributes`
diff --git a/grid2op/tests/test_Environment.py b/grid2op/tests/test_Environment.py
index ac1e96df..055f3e86 100644
--- a/grid2op/tests/test_Environment.py
+++ b/grid2op/tests/test_Environment.py
@@ -845,7 +845,7 @@ def _check_env_param(self, env, param):
         # type of power flow to play
         # if True, then it will not disconnect lines above their thermal limits
         assert env._no_overflow_disconnection == param.NO_OVERFLOW_DISCONNECTION
-        assert env._hard_overflow_threshold == param.HARD_OVERFLOW_THRESHOLD
+        assert (env._hard_overflow_threshold == param.HARD_OVERFLOW_THRESHOLD).all()
 
         # store actions "cooldown"
         assert (