diff --git a/docs/.sample_config_header.yaml b/docs/.sample_config_header.yaml
index 35a591d042..8c9b31acdb 100644
--- a/docs/.sample_config_header.yaml
+++ b/docs/.sample_config_header.yaml
@@ -10,5 +10,16 @@
# homeserver.yaml. Instead, if you are starting from scratch, please generate
# a fresh config using Synapse by following the instructions in INSTALL.md.
+# Configuration options that take a time period can be set using a number
+# followed by a letter. Letters have the following meanings:
+# s = second
+# m = minute
+# h = hour
+# d = day
+# w = week
+# y = year
+# For example, setting redaction_retention_period: 5m would remove redacted
+# messages from the database after 5 minutes, rather than 5 months.
+
################################################################################
diff --git a/docs/postgres.md b/docs/postgres.md
index 70fe29cdcc..e71a1975d8 100644
--- a/docs/postgres.md
+++ b/docs/postgres.md
@@ -188,6 +188,9 @@ to do step 2.
It is safe to at any time kill the port script and restart it.
+Note that the database may take up significantly more (25% - 100% more)
+space on disk after porting to Postgres.
+
### Using the port script
Firstly, shut down the currently running synapse server and copy its
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 09a7299871..598fcd4efa 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -10,6 +10,17 @@
# homeserver.yaml. Instead, if you are starting from scratch, please generate
# a fresh config using Synapse by following the instructions in INSTALL.md.
+# Configuration options that take a time period can be set using a number
+# followed by a letter. Letters have the following meanings:
+# s = second
+# m = minute
+# h = hour
+# d = day
+# w = week
+# y = year
+# For example, setting redaction_retention_period: 5m would remove redacted
+# messages from the database after 5 minutes, rather than 5 months.
+
################################################################################
# Configuration file for Synapse.
@@ -1149,24 +1160,6 @@ account_validity:
#
#default_identity_server: https://matrix.org
-# The list of identity servers trusted to verify third party
-# identifiers by this server.
-#
-# Also defines the ID server which will be called when an account is
-# deactivated (one will be picked arbitrarily).
-#
-# Note: This option is deprecated. Since v0.99.4, Synapse has tracked which identity
-# server a 3PID has been bound to. For 3PIDs bound before then, Synapse runs a
-# background migration script, informing itself that the identity server all of its
-# 3PIDs have been bound to is likely one of the below.
-#
-# As of Synapse v1.4.0, all other functionality of this option has been deprecated, and
-# it is now solely used for the purposes of the background migration script, and can be
-# removed once it has run.
-#trusted_third_party_id_servers:
-# - matrix.org
-# - vector.im
-
# Handle threepid (email/phone etc) registration and password resets through a set of
# *trusted* identity servers. Note that this allows the configured identity server to
# reset passwords for accounts!
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