diff --git a/resources/schema/rule-merged/CORE-base.json b/resources/schema/rule-merged/CORE-base.json
index 9b77c67c6..d8bc945f5 100644
--- a/resources/schema/rule-merged/CORE-base.json
+++ b/resources/schema/rule-merged/CORE-base.json
@@ -79,7 +79,8 @@
             "RELREF",
             "RELSPEC",
             "RELSUB",
-            "SUPP--"
+            "SUPP--",
+            "TUMOR"
           ],
           "type": "string"
         },
diff --git a/resources/schema/rule/CORE-base.json b/resources/schema/rule/CORE-base.json
index 4b9f5537c..99a7622f0 100644
--- a/resources/schema/rule/CORE-base.json
+++ b/resources/schema/rule/CORE-base.json
@@ -79,7 +79,8 @@
             "RELREF",
             "RELSPEC",
             "RELSUB",
-            "SUPP--"
+            "SUPP--",
+            "TUMOR"
           ],
           "type": "string"
         },