diff --git a/dotfiles/systemd/polybar-weather.service b/dotfiles/systemd/polybar-weather.service
index d711d8c..a795002 100644
--- a/dotfiles/systemd/polybar-weather.service
+++ b/dotfiles/systemd/polybar-weather.service
@@ -4,6 +4,7 @@ PartOf=graphical-session.target
 After=polybar.service
 
 [Service]
+# Get one from https://openweathermap.org/, it's free
 Environment=OWM_API_KEY=81687c78e0376836871a6cb9fc347249
 ExecStart=/usr/bin/mkdir -p %h/.cache/i3
 ExecStart=%h/.config/i3/bin/polybar-weather