diff --git a/README.md b/README.md
index 939e21f..5cc44b6 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ Background / daemon:
 ``` bash
 RUST_LOG=ytd=warn NO_COLOR=1 /usr/local/bin/ytd -c /etc/config.toml
 ```
+* make sure `update` option is defined (in the config file)
 
 ### systemd