diff --git a/databases/gtdb-tk.json b/databases/gtdb-tk.json
index 6616a26..d5bc937 100644
--- a/databases/gtdb-tk.json
+++ b/databases/gtdb-tk.json
@@ -2,6 +2,7 @@
   "name": "GTDB-Tk",
   "path": "gtdb_tk",
   "doi": "10.1093/bioinformatics/btz848",
+  
   "versions": [
     {
       "name": "2023-06-09",