1 files changed, 2 insertions, 1 deletions

diff --git a/synapse/api/constants.py b/synapse/api/constants.py

index fc04e4d4bd..7cacd107d4 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -260,7 +260,8 @@ class GuestAccess:
 
 class ReceiptTypes:
     READ: Final = "m.read"
-    READ_PRIVATE: Final = "org.matrix.msc2285.read.private"
+    READ_PRIVATE: Final = "m.read.private"
+    UNSTABLE_READ_PRIVATE: Final = "org.matrix.msc2285.read.private"
     FULLY_READ: Final = "m.fully_read"