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1 files changed, 8 insertions, 0 deletions

diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml

index d218aefee5..f658ec8ecd 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -747,6 +747,14 @@ uploads_path: "DATADIR/uploads"
 # link. ``%(app)s`` can be used as a placeholder for the ``app_name`` parameter
 # from the ``email`` section.
 #
+# Once this feature is enabled, Synapse will look for registered users without an
+# expiration date at startup and will add one to every account it found using the
+# current settings at that time.
+# This means that, if a validity period is set, and Synapse is restarted (it will
+# then derive an expiration date from the current validity period), and some time
+# after that the validity period changes and Synapse is restarted, the users'
+# expiration dates won't be updated unless their account is manually renewed.
+#
 #account_validity:
 #  enabled: True
 #  period: 6w