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-rw-r--r--synapse/api/constants.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 489efb7f86..5baba43966 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -16,6 +16,9 @@
 
 """Contains constants from the specification."""
 
+# the "depth" field on events is limited to 2**63 - 1
+MAX_DEPTH = 2**63 - 1
+
 
 class Membership(object):