diff --git a/examples/Simple-Tree/build.lua b/examples/Simple-Tree/build.lua
index 5524c189..2a17f4ff 100755
--- a/examples/Simple-Tree/build.lua
+++ b/examples/Simple-Tree/build.lua
@@ -5,6 +5,7 @@ module = "simple-tree"
 sourcefiledir = "code"
 docfiledir    = "doc"
 typesetfiles  = {"*.dtx","*.tex"}
+packtdszip    = true -- recommended for "tree" layouts
 
 kpse.set_program_name("kpsewhich")
 dofile(kpse.lookup("l3build.lua"))