diff --git a/module.nix b/module.nix
index 839b481..02013ad 100644
--- a/module.nix
+++ b/module.nix
@@ -63,7 +63,7 @@ in {
           PRICEBOT_EXCHANGE_HOST = cfg.exchange-host;
           PRICEBOT_BEBOT_URL = cfg.mattermost-url;
           PRICEBOT_BEBOT_CHANNEL_ID = opts.mattermost-channel-id;
-          PRICEBOT_TARGET_CURRENCY = opts.currency;
+          PRICEBOT_CURRENCY = opts.currency;
           PRICEBOT_NOTIFY_USER = opts.notify-user;
         };
         serviceConfig = {
diff --git a/src/pricebot/core.clj b/src/pricebot/core.clj
index e3e6a34..7adce42 100644
--- a/src/pricebot/core.clj
+++ b/src/pricebot/core.clj
@@ -185,7 +185,10 @@
         missing    (filter (fn [k] (not (get opts k))) keys)]
     (cond (:help opts)           (exit! 0 (println (:summary opts)))
           (:errors opts)         (exit! 1 (println (str/join \newline (:errors opts))))
-          (not (empty? missing)) (exit! 2 (println (str "missing arguments: " (str/join " " (map name missing)))))
+          (not (empty? missing)) (exit! 2 (println (str "missing arguments: " (str/join " " (map name missing))
+                                                        \newline
+                                                        "available: "
+                                                        (str/join " " (keys opts)))))
           :else                  opts)))
 
 (defn -main [& args]