diff --git a/conf/dendrite.yaml b/conf/dendrite.yaml
index 1f1f052..ed247c7 100644
--- a/conf/dendrite.yaml
+++ b/conf/dendrite.yaml
@@ -18,12 +18,17 @@ global:
   private_key: matrix_key.pem
 
   # The paths and expiry timestamps (as a UNIX timestamp in millisecond precision)
-  # to old signing private keys that were formerly in use on this domain. These
+  # to old signing keys that were formerly in use on this domain name. These
   # keys will not be used for federation request or event signing, but will be
   # provided to any other homeserver that asks when trying to verify old events.
   old_private_keys:
+  #  If the old private key file is available:
   #  - private_key: old_matrix_key.pem
   #    expired_at: 1601024554498
+  #  If only the public key (in base64 format) and key ID are known:
+  #  - public_key: mn59Kxfdq9VziYHSBzI7+EDPDcBS2Xl7jeUdiiQcOnM=
+  #    key_id: ed25519:mykeyid
+  #    expired_at: 1601024554498
 
   # How long a remote server can cache our server signing key before requesting it
   # again. Increasing this number will reduce the number of requests made by other
@@ -138,7 +143,7 @@ global:
   dns_cache:
     enabled: true
     cache_size: 4096
-    cache_lifetime: "10m" # 5 minutes; https://pkg.go.dev/time@master#ParseDuration
+    cache_lifetime: "10m" # 10 minutes; https://pkg.go.dev/time@master#ParseDuration
 
 # Configuration for the Appservice API.
 app_service_api:
@@ -176,6 +181,12 @@ client_api:
   recaptcha_bypass_secret: ""
   recaptcha_siteverify_api: ""
 
+  # To use hcaptcha.com instead of ReCAPTCHA, set the following parameters, otherwise just keep them empty.
+  # recaptcha_siteverify_api: "https://hcaptcha.com/siteverify"
+  # recaptcha_api_js_url: "https://js.hcaptcha.com/1/api.js"
+  # recaptcha_form_field: "h-captcha-response"
+  # recaptcha_sitekey_class: "h-captcha"
+
   # TURN server information that this homeserver should send to clients.
   turn:
     turn_user_lifetime: "5m"
@@ -305,6 +316,14 @@ user_api:
   # The default lifetime is 3600000ms (60 minutes).
   # openid_token_lifetime_ms: 3600000
 
+  # Users who register on this homeserver will automatically be joined to the rooms listed under "auto_join_rooms" option.
+  # 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. If the room already exists,
+  # make certain it is a publicly joinable room, i.e. the join rule of the room must be set to 'public'.
+  # As Spaces are just rooms under the hood, Space aliases may also be used.
+  auto_join_rooms:
+  #  - "#main:matrix.org"
+
 # Configuration for Opentracing.
 # See https://github.com/matrix-org/dendrite/tree/master/docs/tracing for information on
 # how this works and how to set it up.