diff --git a/etc/chrony/sources.d/ntppool.sources b/etc/chrony/sources.d/ntppool.sources
index 94d68e8a..8299e511 100644
--- a/etc/chrony/sources.d/ntppool.sources
+++ b/etc/chrony/sources.d/ntppool.sources
@@ -1,4 +1,10 @@
-# Uncomment only one, the required one, if any
+# Uncomment only one, if any. https://www.ntppool.org/en/use.html
+
+# https://www.ntppool.org/zone/@
 #pool pool.ntp.org iburst
+
+# https://www.ntppool.org/zone/europe
 #pool europe.pool.ntp.org iburst
+
+# https://www.ntppool.org/zone/fi
 #pool fi.pool.ntp.org iburst