diff --git a/socketio/asyncio_client.py b/socketio/asyncio_client.py
index c2a2e09..60dbdff 100644
--- a/socketio/asyncio_client.py
+++ b/socketio/asyncio_client.py
@@ -35,7 +35,8 @@ class AsyncClient(client.Client):
                                  adjusted by +/- 50%.
     :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 are 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
@@ -57,7 +58,9 @@ class AsyncClient(client.Client):
                        The 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 is_asyncio_based(self):
         return True
diff --git a/socketio/asyncio_server.py b/socketio/asyncio_server.py
index 251d581..0115a47 100644
--- a/socketio/asyncio_server.py
+++ b/socketio/asyncio_server.py
@@ -21,7 +21,8 @@ class AsyncServer(server.Server):
                            is stored in an in-memory structure, so the use of
                            multiple connected servers is not possible.
     :param logger: To enable logging set to ``True`` or pass a logger object to
-                   use. To disable logging set to ``False``.
+                   use. To disable logging set to ``False``. Note that fatal
+                   errors are logged even when ``logger`` is ``False``.
     :param json: An alternative json module to use for encoding and decoding
                  packets. Custom json modules must have ``dumps`` and ``loads``
                  functions that are compatible with the standard library
@@ -64,7 +65,8 @@ class AsyncServer(server.Server):
                             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``.
+                            ``False``. Note that fatal errors are logged even
+                            when ``engineio_logger`` is ``False``.
     """
     def __init__(self, client_manager=None, logger=False, json=None,
                  async_handlers=True, **kwargs):
diff --git a/socketio/client.py b/socketio/client.py
index e917d63..313b017 100644
--- a/socketio/client.py
+++ b/socketio/client.py
@@ -51,7 +51,8 @@ class Client(object):
                                  adjusted by +/- 50%.
     :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 are 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
@@ -73,7 +74,9 @@ class Client(object):
                        The 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, reconnection=True, reconnection_attempts=0,
                  reconnection_delay=1, reconnection_delay_max=5,
diff --git a/socketio/server.py b/socketio/server.py
index 76b7d2e..8848de7 100644
--- a/socketio/server.py
+++ b/socketio/server.py
@@ -23,7 +23,8 @@ class Server(object):
                            multiple connected servers is not possible.
     :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 are 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
@@ -92,7 +93,9 @@ class Server(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, client_manager=None, logger=False, binary=False,
                  json=None, async_handlers=True, always_connect=False,