diff --git a/README.md b/README.md
index 36122ae..9fb8845 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,8 @@ SELECT shops.title, items.name, shop_items.price, items.item_id,
 	LEFT JOIN shop_snapshots ON shop_snapshots.shop_id=shops.id
 	LEFT JOIN shop_items ON shop_items.snapshot_id=shop_snapshots.id
 	LEFT JOIN items ON shop_items.item_id=items.id
-	WHERE shop_snapshots.last_seen_date=(SELECT MAX(last_seen_date) FROM shop_snapshots)
+	WHERE shops.type=1 AND
+		shop_snapshots.last_seen_date=(SELECT max(last_seen_date) FROM shop_snapshots)
 ) GROUP BY item_id
 ```
 
@@ -89,4 +90,4 @@ This returns an estimate in MiB of the total storage occupied by the saved JSON
 
 ```
 SELECT SUM(LENGTH(source))/1024/1024 FROM source_store
-```
\ No newline at end of file
+```