diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 94e1ec698f..2d27b0b34d 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -283,7 +283,7 @@ listeners:
# number of monthly active users.
#
# 'limit_usage_by_mau' disables/enables monthly active user blocking. When
-# anabled and a limit is reached the server returns a 'ResourceLimitError'
+# enabled and a limit is reached the server returns a 'ResourceLimitError'
# with error type Codes.RESOURCE_LIMIT_EXCEEDED
#
# 'max_mau_value' is the hard limit of monthly active users above which
@@ -1210,7 +1210,11 @@ account_threepid_delegates:
#enable_3pid_changes: false
# Users who register on this homeserver will automatically be joined
-# to these rooms
+# to these rooms.
+#
+# By default, any room aliases included in this list will be created
+# as a publicly joinable room when the first user registers for the
+# homeserver. This behaviour can be customised with the settings below.
#
#auto_join_rooms:
# - "#example:example.com"
@@ -1218,10 +1222,62 @@ account_threepid_delegates:
# Where auto_join_rooms are specified, setting this flag ensures that the
# the rooms exist by creating them when the first user on the
# homeserver registers.
+#
+# By default the auto-created rooms are publicly joinable from any federated
+# server. Use the autocreate_auto_join_rooms_federated and
+# autocreate_auto_join_room_preset settings below to customise this behaviour.
+#
# Setting to false means that if the rooms are not manually created,
# users cannot be auto-joined since they do not exist.
#
-#autocreate_auto_join_rooms: true
+# Defaults to true. Uncomment the following line to disable automatically
+# creating auto-join rooms.
+#
+#autocreate_auto_join_rooms: false
+
+# Whether the auto_join_rooms that are auto-created are available via
+# federation. Only has an effect if autocreate_auto_join_rooms is true.
+#
+# Note that whether a room is federated cannot be modified after
+# creation.
+#
+# Defaults to true: the room will be joinable from other servers.
+# Uncomment the following to prevent users from other homeservers from
+# joining these rooms.
+#
+#autocreate_auto_join_rooms_federated: false
+
+# The room preset to use when auto-creating one of auto_join_rooms. Only has an
+# effect if autocreate_auto_join_rooms is true.
+#
+# This can be one of "public_chat", "private_chat", or "trusted_private_chat".
+# If a value of "private_chat" or "trusted_private_chat" is used then
+# auto_join_mxid_localpart must also be configured.
+#
+# Defaults to "public_chat", meaning that the room is joinable by anyone, including
+# federated servers if autocreate_auto_join_rooms_federated is true (the default).
+# Uncomment the following to require an invitation to join these rooms.
+#
+#autocreate_auto_join_room_preset: private_chat
+
+# The local part of the user id which is used to create auto_join_rooms if
+# autocreate_auto_join_rooms is true. If this is not provided then the
+# initial user account that registers will be used to create the rooms.
+#
+# The user id is also used to invite new users to any auto-join rooms which
+# are set to invite-only.
+#
+# It *must* be configured if autocreate_auto_join_room_preset is set to
+# "private_chat" or "trusted_private_chat".
+#
+# Note that this must be specified in order for new users to be correctly
+# invited to any auto-join rooms which have been set to invite-only (either
+# at the time of creation or subsequently).
+#
+# Note that, if the room already exists, this user must be joined and
+# have the appropriate permissions to invite new members.
+#
+#auto_join_mxid_localpart: system
# When auto_join_rooms is specified, setting this flag to false prevents
# guest accounts from being automatically joined to the rooms.
@@ -1454,7 +1510,7 @@ saml2_config:
# The lifetime of a SAML session. This defines how long a user has to
# complete the authentication process, if allow_unsolicited is unset.
- # The default is 5 minutes.
+ # The default is 15 minutes.
#
#saml_session_lifetime: 5m
@@ -1539,7 +1595,7 @@ saml2_config:
# use an OpenID Connect Provider for authentication, instead of its internal
# password database.
#
-# See https://github.com/matrix-org/synapse/blob/master/openid.md.
+# See https://github.com/matrix-org/synapse/blob/master/docs/openid.md.
#
oidc_config:
# Uncomment the following to enable authorization against an OpenID Connect
@@ -1973,6 +2029,26 @@ spam_checker:
# example_stop_events_from: ['@bad:example.com']
+## Rooms ##
+
+# Controls whether locally-created rooms should be end-to-end encrypted by
+# default.
+#
+# Possible options are "all", "invite", and "off". They are defined as:
+#
+# * "all": any locally-created room
+# * "invite": any room created with the "private_chat" or "trusted_private_chat"
+# room creation presets
+# * "off": this option will take no effect
+#
+# The default value is "off".
+#
+# Note that this option will only affect rooms created after it is set. It
+# will also not affect rooms created by other servers.
+#
+#encryption_enabled_by_default_for_room_type: invite
+
+
# Uncomment to allow non-server-admin users to create groups on this server
#
#enable_group_creation: true
|
