1 files changed, 15 insertions, 0 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 6c3958f7ab..414e4c019a 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -119,6 +119,9 @@ class EventTypes:
     SpaceChild = "m.space.child"
     SpaceParent = "m.space.parent"
 
+    MSC2716_INSERTION = "org.matrix.msc2716.insertion"
+    MSC2716_MARKER = "org.matrix.msc2716.marker"
+
 
 class ToDeviceEventTypes:
     RoomKeyRequest = "m.room_key_request"
@@ -185,6 +188,18 @@ class EventContentFields:
     # cf https://github.com/matrix-org/matrix-doc/pull/1772
     ROOM_TYPE = "type"
 
+    # Used on normal messages to indicate they were historically imported after the fact
+    MSC2716_HISTORICAL = "org.matrix.msc2716.historical"
+    # For "insertion" events
+    MSC2716_NEXT_CHUNK_ID = "org.matrix.msc2716.next_chunk_id"
+    # Used on normal message events to indicate where the chunk connects to
+    MSC2716_CHUNK_ID = "org.matrix.msc2716.chunk_id"
+    # For "marker" events
+    MSC2716_MARKER_INSERTION = "org.matrix.msc2716.marker.insertion"
+    MSC2716_MARKER_INSERTION_PREV_EVENTS = (
+        "org.matrix.msc2716.marker.insertion_prev_events"
+    )
+
 
 class RoomEncryptionAlgorithms:
     MEGOLM_V1_AES_SHA2 = "m.megolm.v1.aes-sha2"