diff --git a/collects/teachpack/2htdp/scribblings/universe.scrbl b/collects/teachpack/2htdp/scribblings/universe.scrbl
index 0a2ed635c4..e9f0f25706 100644
--- a/collects/teachpack/2htdp/scribblings/universe.scrbl
+++ b/collects/teachpack/2htdp/scribblings/universe.scrbl
@@ -37,7 +37,7 @@
    datatypes are currently linked as technical terms --- which is a hack.
    Fix the paragraph when we have a better way to link datatype names.}
 
-This @tt{universe.rkt} teachpack implements and provides the functionality
+The @tt{universe.rkt} teachpack implements and provides the functionality
  for creating interactive, graphical programs that consist of plain
  mathematical functions. We refer to such programs as @deftech{world}
  programs. In addition, world programs can also become a part of a
diff --git a/collects/teachpack/htdp/scribblings/shared.rkt b/collects/teachpack/htdp/scribblings/shared.rkt
index 09d00dc9d5..82ade26c81 100644
--- a/collects/teachpack/htdp/scribblings/shared.rkt
+++ b/collects/teachpack/htdp/scribblings/shared.rkt
@@ -7,7 +7,7 @@
 
 (define (teachpack tp . name)
   (apply title #:tag tp
-         `(,@name ": " ,(filepath (format "~a.ss" tp))
+         `(,@name ": " ,(filepath (format "~a.rkt" tp))
            ,(index (format "~a teachpack" tp)))))
 
 (define-syntax-rule (def-req beg-require)