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+SpiderMonkey in-tree documentation
+==================================
+
+This directory contains documentation for selected parts of SpiderMonkey. The
+docs are published on the [Mozilla Developer Network][mdn], but this is the
+authoritative copy; the MDN pages are updated from these files by a script. At
+the moment, we have:
+
+- `js/src/doc/Debugger`, SpiderMonkey's JavaScript debugging API, commonly
+  known as `Debugger`.
+
+- `js/src/doc/SavedFrame`, SpiderMonkey's compact representation for captured
+  call stacks.
+
+and that's it.
+
+To format the documentation, you'll need to install [Pandoc][], a
+documentation format conversion program. Pandoc can convert Markdown text,
+which is pleasant to read and write, into HTML, which is what MDN expects.
+
+[mdn]: http://developer.mozilla.org "Mozilla Developer Network"
+[Pandoc]: http://www.johnmacfarlane.net/pandoc/installing.html
+
+Management scripts
+------------------
+
+There are two scripts you may want to use while working with `js/src/doc`
+subdirectories:
+
+- `format.sh [--mdn] SOURCEDIR OUTPUTDIR` produces HTML from the document
+  sources in SOURCEDIR, placing the results in OUTPUTDIR. You can then
+  check their appearance with a web browser.
+
+  Normally, format.sh arranges the links and HTML metadata so that the
+  pages view correctly when visited at `file://` URLS pointing into
+  OUTPUTDIR. However, pages published to MDN should not have the HTML
+  metadata that stand-alone pages need, and their relative positions may be
+  different; passing the `--mdn` switch tells `format.sh` to produce output
+  for publication to MDN, not for previewing on disk.
+
+  (Why are the links affected by `--mdn`? The MDN wiki allows you to create
+  a page named `.../foo`, and then create sub-pages named `.../foo/bar`.
+  This is a nice way to arrange, say, a summary page and then sub-pages
+  providing details. But it's impossible to create the parallel structure
+  on a POSIX file system: `.../foo` can't be both a file and a directory,
+  so the links that would be correct when published on the wiki cannot be
+  correct when previewing those pages on disk. Since OUTPUTDIR's layout
+  can't match that of the wiki, we make it match that of SOURCEDIR.)
+
+- `publish.sh SOURCEDIR OUTPUTDIR KEYID SECRET` calls `format.sh`, and then
+  posts the pages to MDN, using KEYID and SECRET to establish your
+  identity. This posts only changed pages, so you can run it whenever the
+  text you have is the right stuff to publish, without creating gratuitous
+  churn in the MDN page history.
+
+  To generate KEYID and SECRET, visit the [MDN API key generation page][mdnkey].
+
+[mdnkey]: https://developer.mozilla.org/en-US/keys/ "MDN API key generation"
+
+
+Why not make the wiki the authoritative copy?
+---------------------------------------------
+
+Storing documentation in the same tree as the sources it describes has several
+advantages:
+
+- It's easy to handle documentation changes as part of the same review process
+  we use for code changes. A patch posted to Bugzilla can contain code, test,
+  and doc changes, all of which can be discussed together.
+
+- The version control system that manages the code also manages its
+  documentation. Branching the code (for Nightly, Aurora, Beta, or Release)
+  branches the docs as well, so one can always find the docs that match the
+  code in a given release stage.
+
+- Documentation for proposed changes has a natural home: in the patches
+  that implement the change (or, at least, in a patch attached to the bug
+  discussing the change). There's no need to include "(not yet
+  implemented)" markers in the published docs.
+
+
+Subdirectory layout and script interface
+----------------------------------------
+
+Alongside the documentation source files, the SOURCEDIR passed to
+`format.sh` should contain a file named `config.sh` describing the
+directory's contents, how to format them, and where they should be
+installed. This data is represented as executable shell code; `format.sh`
+and `publish.sh` run the subdirectory's `config.sh` script to learn what
+they should do.
+
+The only effect of running a `SOURCEDIR/config.sh` script should be to
+invoke the following commands:
+
+`base-url BASE`
+:   Treat BASE as the common prefix for some URLs appearing as arguments to
+    subsequently executed commands (other than resource files). In
+    describing the other commands, we use the metavariable RELATIVE-URL for
+    URLs that are relative to BASE.
+
+    This command should appear before those taking RELATIVE-URL arguments.
+
+    BASE is treated as the root directory of the tree of formatted files.
+    If OUTPUTDIR is the output directory passed to `format.sh` or
+    `publish.sh`, then formatted files appear in OUTPUTDIR at the paths
+    they would appear on MDN relative to BASE.
+
+`markdown FILE RELATIVE-URL`
+:   Treat FILE as Markdown source for a documentation page to be published
+    at RELATIVE-URL.
+
+`label LABEL [FRAGMENT] [TITLE]`
+:   Define a label for use in Markdown reference-style links referring to
+    the file given in the preceding `markdown` command. If the second
+    argument begins with a `#` character, it is taken to be an HTML
+    fragment identifier; the link refers to that fragment in the page.
+    TITLE, if present, is the title for the link.
+
+    For example:
+
+        base-url https://devmo/Tools/
+        markdown Conventions.md Debugger-API/Conventions
+        label conventions "Debugger API: general conventions"
+        label cv #completion-values "Debugger API: completion values"
+
+    would mean that `Conventions.md` should be processed to create
+    `https://devmo/Tools/Debugger-API/Conventions`; that Markdown files can
+    refer to that page like this:
+
+        ... follows some [common conventions][conventions] which ...
+
+    and to the `#completion-values` fragment in that page like this:
+
+        ... is passed a [completion value][cv] indicating ...
+
+`absolute-label LABEL URL [TITLE]`
+:   For reference-style links in this directory's Markdown files, define
+    LABEL to refer to URL, an absolute URL. TITLE is an optional link title.
+
+`resource LABEL FILE URL`
+:   Treat FILE as a resource file (an image, for example) that should
+    appear at URL. Since MDN likes to place "attachments" like images under
+    different URL prefixes than the wiki pages themselves, URL is not
+    relative to the BASE passed to base-url.
+
+    LABEL can be the empty string if no Markdown documents need to refer to
+    this resource file. (For example, the Markdown might use an SVG file,
+    which in turn use the resource file.)
+
+    Unfortunately, `publish.sh` can't automatically post these resources to
+    MDN at the moment. However, it will check if the contents have changed,
+    and print a warning.
+
+
+This ought to be integrated with mach
+-------------------------------------
+
+Indeed. It should somehow be unified with 'mach doc', which seems to
+format in-tree docs of a different kind, and use a different markup
+language (ReStructuredText) and a different formatter (Sphinx).