diff --git a/tests/files/README b/tests/files/README
index 584e6ba4..b89c494c 100644
--- a/tests/files/README
+++ b/tests/files/README
@@ -170,6 +170,9 @@
 
     bad-0-backward_size.xz has wrong Backward Size in Stream Footer.
 
+    bad-0-index-1.xz has truncated Index that starts with a huge value
+    in Number of Records.
+
     bad-1-stream_flags-1.xz has different Stream Flags in Stream Header
     and Stream Footer.
 
diff --git a/tests/files/bad-0-index-1.xz b/tests/files/bad-0-index-1.xz
new file mode 100644
index 00000000..98cde8fa
Binary files /dev/null and b/tests/files/bad-0-index-1.xz differ