diff --git a/README.md b/README.md
index 446a254..6870a67 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ dns service. It uses curl.
 git clone https://gitlab.com/rascul/he-ddns
 cd he-ddns
 sudo install -o root -g root -m 0755 he-ddns /usr/local/bin/
-sudo install -o root -g root -m 0644 he-ddnsrc /usr/local/etc/
+sudo install -o root -g root -m 0600 he-ddnsrc /usr/local/etc/
 sudoedit /usr/local/etc/he-ddnsrc
 sudo install -o root -g root -m 0644 he-ddns.{service,timer} /etc/systemd/system/
 sudo systemctl daemon-reload