diff --git a/ingestion-data/collections/combined_CMIP6_daily_GISS-E2-1-G_tas_kerchunk_DEMO.json b/ingestion-data/collections/combined_CMIP6_daily_GISS-E2-1-G_tas_kerchunk_DEMO.json
index 70c1ddd..c4b364e 100644
--- a/ingestion-data/collections/combined_CMIP6_daily_GISS-E2-1-G_tas_kerchunk_DEMO.json
+++ b/ingestion-data/collections/combined_CMIP6_daily_GISS-E2-1-G_tas_kerchunk_DEMO.json
@@ -99,5 +99,11 @@
                 "host"
             ]
         }
-    ]
+    ],
+    "summaries": {
+        "datetime": [
+            "1950-01-01T12:00:00Z",
+            "2014-12-31T12:00:00Z"
+          ]
+    }
 }
\ No newline at end of file