diff --git a/collects/teachpack/htdp/Docs/guess.scrbl b/collects/teachpack/htdp/Docs/guess.scrbl
new file mode 100644
index 0000000000..67a1361d12
--- /dev/null
+++ b/collects/teachpack/htdp/Docs/guess.scrbl
@@ -0,0 +1,43 @@
+#lang scribble/doc
+
+@(require scribble/manual
+          (for-label scheme 
+	  	     teachpack/htdp/guess))
+
+@title[#:tag "guess"]{Guessing Numbers: guess.ss}
+
+@declare-exporting[teachpack/htdp/guess]
+
+The teachpack provides operations to play a guess-the-number game. Each
+operation display a GUI in which a player can choose specific values for
+some number of digits and then check the guess. The more advanced
+operations ask students to implement more of the game.
+
+@defproc[(guess-with-gui [check-guess (-> number? number? symbol?)]) true]{
+The @scheme[check-guess] function consumes two numbers: @scheme[guess], which
+is the user's guess, and @scheme[target], which is the randomly
+chosen number-to-be-guessed. The result is a symbol that reflects the
+relationship of the player's guess to the target.}
+
+@defproc[(guess-with-gui-3  [check-guess (-> digit? digit? digit? number? symbol?)]) true]{
+The @scheme[check-guess] function consumes three digits (@scheme[digit0],
+@scheme[digit1], @scheme[digit2]) and one number (@scheme[target]). The
+latter is the randomly chosen number-to-be-guessed; the three digits are
+the current guess. The result is a symbol that reflects the relationship of
+the player's guess (the digits converted to a number) to the target.
+
+Note: @scheme[digit0] is the @emph{least} significant digit that
+the user chose and @scheme[digit2] is the @emph{most} significant
+one.}
+
+@defproc[(guess-with-gui-list [check-guess (-> (list-of digit?) number? symbol?)]) true]{
+The @scheme[check-guess] function consumes a list of digits
+(@scheme[digits]) and a number (@scheme[target]). The former is  a list
+that makes up the user's guess, and the latter is the randomly chosen
+number-to-be-guessed. The result is a symbol that reflects the
+relationship of the player's guess (the digits converted to a number) to
+the target.
+
+Note: the first item on @scheme[digits] is the @emph{least}
+significant digit that the user chose, and the last one is the
+@emph{most} significant digit.}
diff --git a/collects/teachpack/htdp/Docs/guess.thtml b/collects/teachpack/htdp/Docs/guess.thtml
deleted file mode 100644
index 41ef3e8911..0000000000
--- a/collects/teachpack/htdp/Docs/guess.thtml
+++ /dev/null
@@ -1,49 +0,0 @@
-{ (define LIBNAME "Guess")
-  (include "head.tinc") }
-
-<p>The teachpack <code>guess.ss</code> provides operations to play a
-guess-the-number game. Each operation display a GUI in which a player
-can choose specific values for some number of digits and then check the
-guess. The more advanced operations ask students to implement more of the
-game. </p>
-
-<p> The teachpack provides three operations:
-<menu>
-  <li><code>{(idx guess-with-gui)} : check-guess -> true; </code> <br>
-  The check-guess function consumes two numbers: <code>guess</code>, which
-  is the user's guess, and <code>target</code>, which is the randomly
-  chosen number-to-be-guessed. The result is a symbol that reflects the
-  relationship of the player's guess to the target.
-  <br><br>
-
-  <li><code>{(idx guess-with-gui-3)} : check-guess -> true; </code> <br>
-
-  The check-guess function consumes three digits and one number:
-  <code>digit0, digit1, digit2</code>, which make up the user's guess, and
-  <code>target</code>, which is the randomly chosen
-  number-to-be-guessed. The result is a symbol that reflects the
-  relationship of the player's guess (the digits converted to a number) to
-  the target.
-  <br><br>
-
-  Note: <code>digit0</code> is the <em>least</em> significant digit that
-  the user chose and <code>digit2</code> is the <em>most</em> significant
-  one.
-
-  <li><code>{(idx guess-with-gui-list)} : check-guess -> true; </code> <br>
-
-  The check-guess function consumes a list of digits and one number:
-  <code>digits</code>, a list that makes up the user's guess, and
-  <code>target</code>, which is the randomly chosen
-  number-to-be-guessed. The result is a symbol that reflects the
-  relationship of the player's guess (the digits converted to a number) to
-  the target.
-  <br><br>
-
-  Note: the first item on <code>digits</code> is the <em>least</em>
-  significant digit that the user chose, and the last one is the
-  <em>most</em> significant digit.
-
-</menu>
-
-{(include "foot.tinc")}