diff --git a/po/cs.po b/po/cs.po
index 0ff21a2847..c508241b91 100644
--- a/po/cs.po
+++ b/po/cs.po
@@ -1194,7 +1194,7 @@ msgstr "Přidat graf do mřížky"
 
 #: js/messages.php:109
 msgid "Please add at least one variable to the series"
-msgstr ""
+msgstr "Prosím přidejte do série alespoň jednu hodnotu"
 
 #: js/messages.php:110 libraries/display_export.lib.php:306
 #: libraries/display_tbl.lib.php:561 libraries/export/sql.php:1039