diff --git a/helpers/fail2ban b/helpers/fail2ban
index 80c2bda34..31f55b312 100644
--- a/helpers/fail2ban
+++ b/helpers/fail2ban
@@ -53,6 +53,8 @@
 # You can find some more explainations about how to make a regex here :
 # https://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Filters
 #
+# Note that the logfile need to exist before to call this helper !!
+#
 # To validate your regex you can test with this command:
 # ```
 # fail2ban-regex /var/log/YOUR_LOG_FILE_PATH /etc/fail2ban/filter.d/YOUR_APP.conf