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diff --git a/assignment3.mdwn b/assignment3.mdwn
index 289f818a..4da627a5 100644
--- a/assignment3.mdwn
+++ b/assignment3.mdwn
@@ -1,6 +1,19 @@
 Assignment 3
 ------------
 
+Erratum corrected 11PM Sun 3 Oct: the following line
+
+	let tb = (make_list t12 (make_list t3 empty)) in
+
+originally read 
+
+	let tb = (make_list t12 t3) in
+
+This has been corrected below, and in the preloaded evaluator for 
+working on assignment 3.
+
+
+
 Once again, the lambda evaluator will make working through this
 assignment much faster and more secure.
 
@@ -117,7 +130,7 @@ Expected behavior:
 	let t12 = (make_list t1 (make_list t2 empty)) in
 	let t23 = (make_list t2 (make_list t3 empty)) in
 	let ta = (make_list t1 t23) in
-	let tb = (make_list t12 t3) in
+	let tb = (make_list t12 (make_list t3 empty)) in
 	let tc = (make_list t1 (make_list t23 empty)) in
 
 	sum-leaves t1 ~~> 1