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-rw-r--r--synapse/config/database.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/config/database.py b/synapse/config/database.py
index 06ccf15cd9..d7f2219f53 100644
--- a/synapse/config/database.py
+++ b/synapse/config/database.py
@@ -37,6 +37,12 @@ DEFAULT_CONFIG = """\
 # 'txn_limit' gives the maximum number of transactions to run per connection
 # before reconnecting. Defaults to 0, which means no limit.
 #
+# 'allow_unsafe_locale' is an option specific to Postgres. Under the default behavior, Synapse will refuse to
+# start if the postgres db is set to a non-C locale. You can override this behavior (which is *not* recommended)
+# by setting 'allow_unsafe_locale' to true. Note that doing so may corrupt your database. You can find more information
+# here: https://matrix-org.github.io/synapse/latest/postgres.html#fixing-incorrect-collate-or-ctype and here:
+# https://wiki.postgresql.org/wiki/Locale_data_changes
+#
 # 'args' gives options which are passed through to the database engine,
 # except for options starting 'cp_', which are used to configure the Twisted
 # connection pool. For a reference to valid arguments, see: