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diff --git a/assignment10.mdwn b/assignment10.mdwn
index c1a84d3b..ec3b8c14 100644
--- a/assignment10.mdwn
+++ b/assignment10.mdwn
@@ -112,7 +112,21 @@
 		       (insert-co new before after (cdr lst) (lambda (new-lst lefts rights) ________))))))
 
 
-6.	Go back to the "abSd" problem we presented in [[From List Zippers to Continuations]]. Consider the "tc" solution which uses explicitly passed continuations. Try to reimplement this using reset and shift instead of having an explicit `k` argument. This will likely be challenging but rewarding. The notes on [[CPS and Continuation Operators]], especially the examples at the end, should be helpful. We are of course also glad to help you out.
+6.	Go back to the "abSd" problem we presented in [[From List
+Zippers to Continuations]]. Consider the "tc" solution which uses
+explicitly passed continuations. Try to reimplement this using reset
+and shift instead of having an explicit `k` argument. This will likely
+be challenging but rewarding. The notes on [[CPS and Continuation
+Operators]], especially the examples at the end, should be helpful. We
+are of course also glad to help you out.
+
+    Consider adding a special symbol `'#'` (pronounced 'prompt') to the
+    mini-language such that
+
+    `"ab#cdSef"` ~~> `"abcdcdef"`
+
+    That is, the rule for `'S'` is to copy the preceding string, but
+    only up to the closest enclosing `'#'` symbol.
 
 7.	Can you reimplement your solution to [[assignment9]] using reset and shift?