diff --git a/LanguageTags/LanguageSchema.cs b/LanguageTags/LanguageSchema.cs
index b507611..090dfdc 100644
--- a/LanguageTags/LanguageSchema.cs
+++ b/LanguageTags/LanguageSchema.cs
@@ -2,6 +2,7 @@
 
 namespace ptr727.LanguageTags;
 
+// CI smoke-flow validation marker (temporary; PR not for merge).
 internal static class LanguageSchema
 {
     internal static string GetCodeGenString(string? text) =>