diff --git a/luprex/core/cpp/world-diffxmit.cpp b/luprex/core/cpp/world-diffxmit.cpp
index b5c4c553..d36c29a9 100644
--- a/luprex/core/cpp/world-diffxmit.cpp
+++ b/luprex/core/cpp/world-diffxmit.cpp
@@ -227,6 +227,7 @@ void World::patch_tanclass(StreamBuffer *sb, DebugCollector *dbc) {
         assert(LS.istable(tab));
         LS.getmetatable(meta, tab);
         std::string name = sb->read_string();
+        DebugLine(dbc) << "tanclass " << id << "=" << name;
         if (name == "") {
             LS.rawset(meta, "__index", LuaNil);
         } else {