diff --git a/scripts/upgrade b/scripts/upgrade
index 749083b..7a0fb2a 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -73,7 +73,9 @@ fi
 # See https://www.dokuwiki.org/plugin:config#protecting_settings
 
 # Configuration dedicated to Yunohost (LDAP and admin mainly)
-# Create file if it does not exist
+# Create an empty configuration file if it does not exist
+# This file will be overwritten anyway later in the part "# LDAP Configuration"
+# The file is created here to prevent a failure of the helper `ynh_backup_if_checksum_is_different`
 if [ ! -f "$final_path/conf/local.protected.php" ]; then
 	touch $final_path/conf/local.protected.php
 fi