Upgrade script - add comment

scripts/upgrade

@@ -84,6 +84,12 @@ if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_script_progression --message="Upgrading source files..."
 
+	# For aeneria source update, we use a temporary directory because
+	# without it, patche can't be apply correctly:
+	# In 'app-00-ldap-auth.patch' we create a new file, if we try
+	# to apply the patch a second time while the file already exists, it
+	# throws a warning leading to an upgrade fail.
+
 	# Create tmpdir for new sources
 	tmpdir="$(ynh_smart_mktemp min_size=300)"
 

sources/patches/app-00-ldap-auth.patch

@@ -176,3 +176,4 @@ index 0000000..39ba1e8
 +        return $values[0];
 +    }
 +}
+--