diff --git a/src/Main.cc b/src/Main.cc
index 74ffe93d..812055cb 100644
--- a/src/Main.cc
+++ b/src/Main.cc
@@ -260,8 +260,7 @@ The actions are:\n\
     has the same structure as system/blueburst/rare-table.json.\n\
   generate-dc-serial-number [--domain=DOMAIN] [--subdomain=SUBDOMAIN]\n\
     Generate a PSO DC serial number. DOMAIN should be 0 for Japanese, 1 for\n\
-    USA, or 2 for Europe. SUBDOMAIN should be 2 for European DCv1 or 1 for any\n\
-    other version.\n\
+    USA, or 2 for Europe. SUBDOMAIN should be 0 for v1, or 1 for v2.\n\
   generate-all-dc-serial-numbers\n\
     Generate all possible PSO DC serial numbers.\n\
   inspect-dc-serial-number SERIAL-NUMBER\n\