diff --git a/accession-commons-core/src/main/java/uk/ac/ebi/ampt2d/commons/accession/core/models/EventType.java b/accession-commons-core/src/main/java/uk/ac/ebi/ampt2d/commons/accession/core/models/EventType.java
index d7b5670f..c3ccfc9d 100644
--- a/accession-commons-core/src/main/java/uk/ac/ebi/ampt2d/commons/accession/core/models/EventType.java
+++ b/accession-commons-core/src/main/java/uk/ac/ebi/ampt2d/commons/accession/core/models/EventType.java
@@ -39,6 +39,8 @@ public enum EventType {
     RS_SPLIT,
 
     // accession is no longer valid
-    DEPRECATED
+    DEPRECATED,
 
+    // RS ID was back-propagated from a remapped assembly
+    RS_BACK_PROPAGATED
 }