diff --git a/tests/upload/fixture/txt b/tests/upload/fixture/txt
index d3c40d2ea7..a78c858f5c 100644
--- a/tests/upload/fixture/txt
+++ b/tests/upload/fixture/txt
@@ -1 +1,2 @@
 <HTML>mime trigger</HTML>
+The HTML tags should remain uppercase so that case-insensitivity can be checked.