diff --git a/lib/Lacuna/DB/Result/Building/Permanent/GeoThermalVent.pm b/lib/Lacuna/DB/Result/Building/Permanent/GeoThermalVent.pm
index a0bdee5d..0e03c279 100644
--- a/lib/Lacuna/DB/Result/Building/Permanent/GeoThermalVent.pm
+++ b/lib/Lacuna/DB/Result/Building/Permanent/GeoThermalVent.pm
@@ -12,11 +12,11 @@ around can_build => sub {
     if ($body->get_plan(__PACKAGE__, 1)) {
         return $orig->($self, $body);  
     }
-    confess [1013,"You can't build an Geo Thermal Vent. It forms naturally."];
+    confess [1013,"You can't build a Geo Thermal Vent. It forms naturally."];
 };
 
 sub can_upgrade {
-    confess [1013, "You can't upgrade an Geo Thermal Vent. It forms naturally."];
+    confess [1013, "You can't upgrade a Geo Thermal Vent. It forms naturally."];
 }
 
 use constant image => 'geothermalvent';