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diff --git a/how_to_get_the_programming_languages_running_on_your_computer.mdwn b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
index 063957a5..a54e9ba5 100644
--- a/how_to_get_the_programming_languages_running_on_your_computer.mdwn
+++ b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
@@ -82,9 +82,11 @@ another Scheme implementation, though, there's no compelling reason to switch.)
 
 Since the name change is so recent, you're likely to run across both sets of names.
 
-PLT Scheme had three salient components: the command-line version "mzscheme", a
-GUI extension "MrEd", and a teaching-friendly editor/front-end "DrScheme". In
-Racket these have been renamed "racket", "gracket", and "DrRacket",
+PLT/Racket stands to Scheme in something like the relation Firefox stands to HTML. It's one program among others for working with the language; and many of the available programs permit different extensions, have small variations, and so on.
+
+PLT Scheme had several components. The two most visible components for us
+were the command-line interpreter "mzscheme" and a teaching-friendly editor/front-end "DrScheme". In
+Racket these have been renamed "racket" and "DrRacket",
 respectively.
 
 
@@ -108,6 +110,14 @@ respectively.
 	If you want the GUI components, I think you'll need to use the
 	"Mac/without MacPorts" installation options above.
 
+	I recommend also typing:
+
+		sudo port install rlwrap
+
+	then if you ever use the command-line program `mzscheme` (or `racket`), you should start it by typing `rlwrap mzscheme`. This gives
+	you a nice history of the commands you've already typed, which you can scroll up and down in with your
+	keyboard arrows.
+
 *	**To install on Linux**
 
 	Use your packaging system, for example, open a Terminal and
@@ -116,10 +126,18 @@ respectively.
 		 sudo apt-get install plt-scheme
 
 	It's very likely that your packaging system has some version of
-	PLT Scheme available, so look for it. However, if you can't find it you
+	PLT Scheme (or Racket) available, so look for it. However, if you can't find it you
 	can also install a pre-packaged binary from the Racket website at <http://racket-lang.org/download/>.
 	Choose the option for your version of Linux (Ubuntu, Debian, and two
-	varieties of Fedora are available)
+	varieties of Fedora are available).
+
+	As above, I recommend you also type:
+
+		sudo apt-get rlwrap
+
+	then if you ever use the command-line program `mzscheme` (or `racket`), you should start it by typing `rlwrap mzscheme`. This gives
+	you a nice history of the commands you've already typed, which you can scroll up and down in with your
+	keyboard arrows.
 
 
 ## Getting OCaml ##
@@ -182,6 +200,13 @@ However, if you're not able to get that working, don't worry about it much.
 
 		sudo port install ocaml caml-findlib
 
+	As with Scheme, it's helpful to also have rlwrap installed, and to start OCaml as `rlwrap ocaml`. This gives
+	you a nice history of the commands you've already typed, which you can scroll up and down in with your
+	keyboard arrows.
+	
+
+*	[More details about installing OCaml on Macs, if needed](http://cocan.org/getting_started_with_ocaml_on_mac_os_x)
+
 *	**To install on Linux**
 
 	Use your packaging system, for example, open a Terminal and
@@ -205,3 +230,7 @@ However, if you're not able to get that working, don't worry about it much.
 	Here are the INSTALL notes:
 	<https://godirepo.camlcity.org/svn/lib-findlib/trunk/INSTALL>.
 
+	As with Scheme, it's helpful to also have rlwrap installed, and to start OCaml as `rlwrap ocaml`. This gives
+	you a nice history of the commands you've already typed, which you can scroll up and down in with your
+	keyboard arrows.
+