diff --git a/collects/htdp/Test/matrix-example.ss b/collects/htdp/Test/matrix-example.ss
index e13f5c4ebe..6dcd86a304 100644
--- a/collects/htdp/Test/matrix-example.ss
+++ b/collects/htdp/Test/matrix-example.ss
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+0 0 22 3 1 #")"
+0 0 68 29 1 #"\n"
+0 0 68 29 1 #"\n"
 0           0
diff --git a/collects/htdp/matrix-sig.ss b/collects/htdp/matrix-sig.ss
index ca1904e418..270cebd322 100644
--- a/collects/htdp/matrix-sig.ss
+++ b/collects/htdp/matrix-sig.ss
@@ -45,5 +45,5 @@ matrix-render ;; [Matrix X] -> [Rectangle String]
 matrix-minor ;; Matrix Nat Nat -> Matrix 
 ;; create a matrix minor from M at (i,j)
 
-matrix-set! ;; [Matrix X] Nat Nat X -> [Matrix X]
+;; matrix-set! ;; [Matrix X] Nat Nat X -> [Matrix X]
 ;; set the matrix at (i,j)