diff --git a/README.md b/README.md
index 5f91169..c85e0f4 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,8 @@ operating system:
 - Windows: `{FOLDERID_RoamingAppData}/findpenguins-feed/config/config.toml`
 - macOS: `$HOME/Library/Preferences/ch.vanwa.findpenguins-feed/config.toml`
 
+Environment variable always take precedence.
+
 ## server_address
 
 IP and port the server should listen on.