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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 0bfcef28..028b0c64 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
@@ -82,6 +82,8 @@ 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/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 those programs (or web browsers) 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",