diff --git a/README.md b/README.md
index 4adf64c..9be0630 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,7 @@ conf.probe.httpaccesslog.file=/var/log/apache2/foo.bar.org-access.log*
 conf.probe.httpaccesslog.pattern=
 # This parameter requires real ip proxy setting and log output setting.
 conf.probe.etherpad.logs=/var/log/etherpad/output.log
+# Database URL. Example of the most frequent cases:
 # jdbc:mariadb://localhost:1234/databasename
 # jdbc:mysql://localhost:1234/databasename
 # jdbc:postgresql://localhost:1234/databasename