diff --git a/marketplace/scribblings/highlevel.scrbl b/marketplace/scribblings/highlevel.scrbl
index 0450734..6373769 100644
--- a/marketplace/scribblings/highlevel.scrbl
+++ b/marketplace/scribblings/highlevel.scrbl
@@ -594,7 +594,9 @@ If @racket[pattern] is supplied, @racket[k-expr] should evaluate to a
 @section{Creating nested VMs}
 
 ***** nested-vm, nested-vm:
+TODO
 
 @section{Relaying across layers}
 
 ***** at-meta-level, at-meta-level:
+TODO
diff --git a/marketplace/scribblings/writing-drivers.scrbl b/marketplace/scribblings/writing-drivers.scrbl
index 2aef963..e8363f4 100644
--- a/marketplace/scribblings/writing-drivers.scrbl
+++ b/marketplace/scribblings/writing-drivers.scrbl
@@ -5,4 +5,8 @@
 @title[#:tag "writing-new-drivers"]{Writing New Drivers}
 
 *** ground-vm's usage of Racket evt?s
+TODO
+example of chat-client.rkt
+
 *** pseudo-substruct
+TODO