diff --git a/api/v1/swagger/definitions/patron.json b/api/v1/swagger/definitions/patron.json
index ebcf696af05..735454f80b2 100644
--- a/api/v1/swagger/definitions/patron.json
+++ b/api/v1/swagger/definitions/patron.json
@@ -139,6 +139,10 @@
       "type": ["string", "null"],
       "description": "date the patron's card is set to expire"
     },
+    "date_renewed": {
+      "type": ["string", "null"],
+      "description": "date the patron's card was last renewed"
+    },
     "gonenoaddress": {
       "type": ["boolean", "null"],
       "description": "set to 1 if library marked this patron as having an unconfirmed address"