diff --git a/po/nb.po b/po/nb.po
index 908a913f9..c9a82be4a 100644
--- a/po/nb.po
+++ b/po/nb.po
@@ -1073,7 +1073,7 @@ msgstr "Dropper kolonne"
 
 #: js/messages.php:67
 msgid "Adding Primary Key"
-msgstr ""
+msgstr "Legger til primærnøkkel"
 
 #: js/messages.php:68 libraries/relation.lib.php:81 pmd_general.php:339
 msgid "OK"