diff --git a/redex-doc/redex/scribblings/long-tut/mon-aft.scrbl b/redex-doc/redex/scribblings/long-tut/mon-aft.scrbl
index 45e0f2b5..b00fcc38 100644
--- a/redex-doc/redex/scribblings/long-tut/mon-aft.scrbl
+++ b/redex-doc/redex/scribblings/long-tut/mon-aft.scrbl
@@ -88,7 +88,7 @@ Now you can formulate language tests:
 (define eb1 (term (lambda (x x) y)))
 (define eb2 (term (lambda (x y) 3)))
 
-(test-equal (lambda? eb1) #false)
+(test-equal (lambda? eb1) #true)
 (test-equal (lambda? eb2) #false)
 
 (test-results)