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-rw-r--r--changelog.d/12288.misc1
-rw-r--r--docs/upgrade.md7
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diff --git a/changelog.d/12288.misc b/changelog.d/12288.misc
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@@ -0,0 +1 @@
+Refuse to start if DB has non-`C` locale, unless config flag `allow_unsafe_db_locale` is set to true.
diff --git a/docs/upgrade.md b/docs/upgrade.md
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--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -99,6 +99,13 @@ experimental_features:
   groups_enabled: false
 ```
 
+## Change in behaviour for PostgreSQL databases with unsafe locale
+
+Synapse now refuses to start when using PostgreSQL with non-`C` values for `COLLATE` and
+`CTYPE` unless the config flag `allow_unsafe_locale`, found in the database section of
+the configuration file, is set to `true`. See the [PostgreSQL documentation](https://matrix-org.github.io/synapse/latest/postgres.html#fixing-incorrect-collate-or-ctype)
+for more information and instructions on how to fix a database with incorrect values.
+
 # Upgrading to v1.55.0
 
 ## `synctl` script has been moved