diff --git a/tests/files/README b/tests/files/README
index b3c4795e..15a75b80 100644
--- a/tests/files/README
+++ b/tests/files/README
@@ -1,6 +1,6 @@
 
-.xz and .lzma Test Files
-------------------------
+.xz, .lzma, and .lz Test Files
+------------------------------
 
 0. Introduction