diff --git a/matrix/m.room.encryption/README.md b/matrix/m.room.encryption/README.md
new file mode 100644
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+```json
+{
+  "algorithm": "m.megolm.v1.aes-sha2",
+  "rotation_period_ms": 604800000,
+  "rotation_period_msgs": 100
+}
+```