diff --git a/docs/06-appearance.md.lua b/docs/06-appearance.md.lua
index 105f3263..0dfad615 100644
--- a/docs/06-appearance.md.lua
+++ b/docs/06-appearance.md.lua
@@ -243,3 +243,4 @@ f:close()
 --TODO generate a complete sample theme
 --TODO also parse C files.
 
+-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80