diff --git a/samples/memfs/memfs_test.go b/samples/memfs/memfs_test.go
index 2700eb6..2cb9e4c 100644
--- a/samples/memfs/memfs_test.go
+++ b/samples/memfs/memfs_test.go
@@ -105,7 +105,7 @@ func (t *MemFSTest) ContentsOfEmptyFileSystem() {
 	ExpectThat(entries, ElementsAre())
 }
 
-func (t *MemFSTest) Mkdir() {
+func (t *MemFSTest) Mkdir_OneLevel() {
 	var err error
 	var fi os.FileInfo
 	var stat *syscall.Stat_t
@@ -146,6 +146,10 @@ func (t *MemFSTest) Mkdir() {
 	ExpectThat(entries, ElementsAre())
 }
 
+func (t *MemFSTest) Mkdir_TwoLevels() {
+	AssertTrue(false, "TODO")
+}
+
 func (t *MemFSTest) Mkdir_AlreadyExists() {
 	var err error
 	dirName := path.Join(t.mfs.Dir(), "dir")