diff --git a/README.md b/README.md
index e30ea8d7..429151a1 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,8 @@ Make two database is Postgres (use TablePlus https://tableplus.com/ or some othe
 
 Ok then run this in TablePlus:
 
+> NOTE: if you are not using the HERD paid version then download https://dbngin.com and run Redis with that.
+
 ```sql
 CREATE EXTENSION vector;
 ```