diff --git a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
index a4d4d5e..222ecee 100644
--- a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
+++ b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/PriceAlarmDefinition.tjava
@@ -20,8 +20,8 @@ public record PriceAlarmDefinition(
         Objects.requireNonNull(trigger, "trigger");
         Objects.requireNonNull(note, "note");
 
-        if (target.signum() <= 0) {
-            throw new IllegalArgumentException("Target price must be positive");
+        if (target.signum() < 0) {
+            throw new IllegalArgumentException("Target price must be positive (was: " + target.signum() + ")!");
         }
     }
 }