diff --git a/open-api/rest-catalog-open-api.py b/open-api/rest-catalog-open-api.py
index 0ffbce063049..ef2132594210 100644
--- a/open-api/rest-catalog-open-api.py
+++ b/open-api/rest-catalog-open-api.py
@@ -220,6 +220,11 @@ class Snapshot(BaseModel):
         alias='first-row-id',
         description='The first _row_id assigned to the first row in the first data file in the first manifest',
     )
+    added_rows: Optional[int] = Field(
+        None,
+        alias='added-rows',
+        description='The upper bound of the number of rows with assigned row IDs',
+    )
     summary: Summary
     schema_id: Optional[int] = Field(None, alias='schema-id')
 
diff --git a/open-api/rest-catalog-open-api.yaml b/open-api/rest-catalog-open-api.yaml
index e0b524a6d726..e55c36b36dc6 100644
--- a/open-api/rest-catalog-open-api.yaml
+++ b/open-api/rest-catalog-open-api.yaml
@@ -2434,6 +2434,10 @@ components:
           type: integer
           format: int64
           description: The first _row_id assigned to the first row in the first data file in the first manifest
+        added-rows:
+          type: integer
+          format: int64
+          description: The upper bound of the number of rows with assigned row IDs
         summary:
           type: object
           required: