diff --git a/flask_socketio/__init__.py b/flask_socketio/__init__.py
index f8353951..f9ea7f70 100644
--- a/flask_socketio/__init__.py
+++ b/flask_socketio/__init__.py
@@ -93,7 +93,8 @@ class SocketIO(object):
                            explicitly.
     :param logger: To enable logging set to ``True`` or pass a logger object to
                    use. To disable logging set to ``False``. The default is
-                   ``False``.
+                   ``False``. Note that fatal errors will be logged even when
+                   ``logger`` is ``False``.
     :param binary: ``True`` to support binary payloads, ``False`` to treat all
                    payloads as text. On Python 2, if this is set to ``True``,
                    ``unicode`` values are treated as text, and ``str`` and
@@ -163,7 +164,9 @@ class SocketIO(object):
                             default is ``True``.
     :param engineio_logger: To enable Engine.IO logging set to ``True`` or pass
                             a logger object to use. To disable logging set to
-                            ``False``. The default is ``False``.
+                            ``False``. The default is ``False``. Note that
+                            fatal errors are logged even when
+                            ``engineio_logger`` is ``False``.
     """
 
     def __init__(self, app=None, **kwargs):