diff --git a/tools/book-check-spelling.retro b/tools/book-check-spelling.retro
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+#!/usr/bin/env retro
+
+This is used to assemble the Markdown copy of the RETRO Handbook.
+
+The individual chapters are in the `book/` directory. This is set
+using the `BOOK-BASE` constant.
+
+~~~
+'doc/book/  'BOOK-BASE s:const
+~~~
+
+The chapters are specified it the `TOC`, a named array. These are
+the file names, they will be included in order. I am structuring
+it using separate file to make the actual editing process easier
+for me.
+
+~~~
+'tools/book-chapters.retro include
+~~~
+
+~~~
+TOC
+[ nl #1 a:fetch dup s:put nl BOOK-BASE 'spell_%s%s s:format unix:system ]
+a:for-each
+~~~
+