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-rw-r--r--synapse/util/retryutils.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py
index 08285e811d..366f7c48a7 100644
--- a/synapse/util/retryutils.py
+++ b/synapse/util/retryutils.py
@@ -87,7 +87,11 @@ class RetryDestinationLimiter(object):
     def __init__(self, destination, clock, store, retry_interval,
                  min_retry_interval=5000, max_retry_interval=60 * 60 * 1000,
                  multiplier_retry_interval=2,):
-        """
+        """Marks the destination as "down" if an exception is thrown in the
+        context, except for CodeMessageException with code < 500.
+
+        If no exception is raised, marks the destination as "up".
+
         Args:
             destination (str)
             clock (Clock)