diff --git a/schema.json b/schema.json
index c2e3b34..ea5d95e 100644
--- a/schema.json
+++ b/schema.json
@@ -13,6 +13,13 @@
 		"duration" : {
 			"description": "durée de l'amortissement en années",
 			"type": "integer"
+		},
+		"amort" : {
+			"description": "id lignes écritures amortissements",
+			"type": ["array", "null"],
+			"items": {
+				"type": "integer"
+			}
 		}
 	},
 	"required": ["type", "line", "duration"]