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+
+# SEPTEMBER
+
+September is a program that takes a source controlled project, goes back to
+specific points in that project's timeline, and does something.
+
+This is typically useful for generating documentation for each released version
+of a project, but it can do other stuff like report on how the code evolved over
+time in terms of amount or complexity.
+
+
+## Usage
+
+You simply run it by pointing at your repo:
+
+    python september.py /path/to/repo --command "foo bar"
+
+By default, this will clone your repository into a temporary directory (which
+you can override with the `--tmp-dir` argument), update back to every tag, and
+run `foo bar` each time at the root of the clone.
+
+September will guess what kind of repository you're giving it, and do the
+appropriate things to clone and update it. Right now Git and Mercurial are
+supported.
+
+
+## Configuration file
+
+You can pass a configuration file to September with the `--config` argument. If
+you have a `.september.cfg` file at the root of your repository, it will pick it
+up automatically otherwise.
+
+The configuration file must specify settings in a `september` section:
+
+    [september]
+    command = echo "Processing tag %(tag)s..."
+    use_shell = 1
+
+Supported configuration settings include:
+
+* `command`: The command to run. Use `%(tag)s` to insert the name of current tag
+  in the command.
+* `use_shell`: Whether the command should be passed to a shell (_e.g._ if using
+  shell commands like `ls` or `echo`, or using pipes or redirection).
+* `first_tag`: Don't update to tags older than the tag specified as the first
+  tag.
+* `tag_pattern`: A regular expression that defines which tags to consider. Any
+  tag that _doesn't_ match the pattern will be ignored.
+