diff --git a/.gitignore b/.gitignore
index b175eb0..d3c89b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@
 *.egg-info/
 build/
 dist/
+site/
 __pycache__
diff --git a/Makefile b/Makefile
index 7a87d4c..5ec855e 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,7 @@ python := $(run) python
 lint   := rye lint -- --select I
 fmt    := rye fmt
 mypy   := $(run) mypy
+mkdocs := $(run) mkdocs
 
 ##############################################################################
 # Local "interactive testing" of the code.
@@ -48,6 +49,20 @@ stricttypecheck:	        # Perform a strict static type checks with mypy
 .PHONY: checkall
 checkall: codestyle lint stricttypecheck # Check all the things
 
+##############################################################################
+# Documentation.
+.PHONY: docs
+docs:                           # Generate the system documentation
+	$(mkdocs) build
+
+.PHONY: rtfm
+rtfm:                           # Locally read the library documentation
+	$(mkdocs) serve
+
+.PHONY: publishdocs
+publishdocs:			# Set up the docs for publishing
+	$(mkdocs) gh-deploy
+
 ##############################################################################
 # Package/publish.
 .PHONY: package
diff --git a/docs/images/default-output-look.png b/docs/images/default-output-look.png
new file mode 100644
index 0000000..cc1cc07
Binary files /dev/null and b/docs/images/default-output-look.png differ
diff --git a/docs/index.md b/docs/index.md
new file mode 100644
index 0000000..476bc40
--- /dev/null
+++ b/docs/index.md
@@ -0,0 +1,261 @@
+## Introduction
+
+[`ng2web`](https://github.com/davep/ng2web) is one in a [long line of Norton
+Guide tools I've written over the latest couple or so
+decades](https://www.davep.org/norton-guides/). It is, in effect, a
+replacement for [`w3ng`](https://github.com/davep/w3ng) and
+[`ng2html`](https://github.com/davep/ng2html).
+
+As for what it does: it will take a [Norton Guide
+file](https://en.wikipedia.org/wiki/Norton_Guides) and turns the content
+into a collection of HTML pages, which you can then incorporate into a web
+site.
+
+## Command line options
+
+The command is called `ng2web` and all command line options can be found
+with:
+
+```sh
+ng2web --help
+```
+
+giving output like this:
+
+```bash exec="on" result="text"
+ng2web --help
+```
+
+The key options are:
+
+### `--index`
+
+By default `ng2web` generates all pages with names that are prefixed with
+the filename of the guide (minus the extension) and, for all pages relating
+to short and long entries, including the byte offset of the entry in the
+guide; this means that amongst the generated pages there's no obvious
+starting location.
+
+Add the `--index` switch to tell `ng2web` to always generate the first entry
+in the guide as the file `index.html`.
+
+### `--output`
+
+Use this switch to optionally specify the output directory for the generated
+HTML. By default all HTML files will be generated in the current directory.
+
+### `--templates`
+
+Use this switch to optionally specify a location to look for templates that
+will override the default templates (see [the next section](#templates) in
+this document for details on how to use templates to control the output of
+`ng2web`).
+
+## Templates
+
+The output of `ng2web` is styled using a collection of templates. The
+builtin templates are designed to give the output a bit of a classic Norton
+Guide reader look.
+
+![Default look of the output](images/default-output-look.png)
+
+There are a number of templates that control each of the major types of
+content inside a Norton Guide.
+
+### The base template (`base.html`)
+
+The base template is the base for the other templates that output a specific
+type of page.
+
+```jinja
+--8<-- "src/ng2web/templates/base.html"
+```
+
+If you wish to change the look and feel of every page in the output, this is
+probably the template you want to [override](#overriding-templates).
+
+### The about page template (`about.html`)
+
+This is the template for the "about" page of the output; typically this is
+where the credits for the guide will be shown.
+
+```jinja
+--8<-- "src/ng2web/templates/about.html"
+```
+
+### The base entry template (`entry.html`)
+
+This is the template that both [short](#the-short-entry-template-shorthtml)
+and [long](#the-long-entry-template-longhtml) entry templates build upon.
+
+```jinja
+--8<-- "src/ng2web/templates/entry.html"
+```
+
+### The short entry template (`short.html`)
+
+This is the template for creating pages from short entries in the guide.
+Short entries typically have no "see also" section and also have lines that
+link elsewhere.
+
+```jinja
+--8<-- "src/ng2web/templates/short.html"
+```
+
+### The long entry template (`long.html`)
+
+This is the template for creating pages from long entries in the guide. Long
+entries typically have an optional "see also" section and have lines that
+don't link anywhere else; the text content of a long entry is simply text,
+not links that go elsewhere.
+
+```jinja
+--8<-- "src/ng2web/templates/long.html"
+```
+
+### Link navigation include (`inc/nav-link.html`)
+
+This is a utility include template that is used by [the base
+template](#the-base-template-basehtml) to emit the navigation links that
+appear at the top of the page: the *About*, *Previous*, *Up* and *Next*
+links.
+
+```jinja
+--8<-- "src/ng2web/templates/inc/nav-link.html"
+```
+
+### The stylesheet template
+
+The stylesheet for the site is generated using this template.
+
+```css
+--8<-- "src/ng2web/templates/base.css"
+```
+
+As you'll see: the bulk of this file is just static CSS; the only part
+making use of templating being the `span` foreground and background colour
+utility classes; the styles being `.bg0` through `.bg15` and `.fg0` through
+`.fg15`. By default the expansion is a selection of web colours that best
+match the colours common in text modes on PC/DOS systems.
+
+The default selection is:
+
+0. black
+1. navy
+2. green
+3. teal
+4. maroon
+5. purple
+6. olive
+7. silver
+8. gray
+9. blue
+10. lime
+11. aqua
+12. red
+13. fuchsia
+14. yellow
+15. white
+
+## Overriding templates
+
+### Custom template locations
+
+By default, when a template is needed, `ng2web` will look in the following
+locations, in the following order. Once a template is found that one is
+used.
+
+1. The directory provided with [the `--templates` switch](#-templates).
+2. `./templates/`, below the current working directory, if it exists.
+3. `ng2web`'s own default templates.
+
+!!! tip
+
+    You only need to make a copy of a template you actually want to change.
+    Overriding one template doesn't mean you need to make a copy of all of
+    them. Each tamplet is individually looked for using these rules.
+
+## Global values
+
+The following global variables are available in the templates:
+
+### `generator`
+
+The generator name for `ng2web`, this will include the version number of
+`ng2web` and of `ngdb` ([the library that `ng2web` is built
+on](https://github.com/davep/ngdb.py)).
+
+An example looks like:
+
+```
+ng2web v0.1.1 (ngdb v0.12.0)
+```
+
+### `guide`
+
+A reference to the guide object that is being used to read the Norton Guide
+file. This allows access to [any of the properties and methods of
+`ngdb.NortonGuide`](https://blog.davep.org/ngdb.py/library-contents/guide/).
+
+!!! warning
+
+    It's best to restrict use of this to read-only properties; calling
+    anything that may change the state of the underlying guide object could
+    cause unexpected results.
+
+### `about_url`
+
+The URL for the about page that will be generated.
+
+### `stylesheet`
+
+The name of the stylesheet that will be generated.
+
+## Available filters
+
+The following filters are made available in the templates:
+
+### `urlify`
+
+Takes a particular linked option within a guide and turns it into a web
+link. Most often used when generating links in entries; for example:
+
+```jinja
+<a class="line" href="{{ line|urlify }}">{{ line.text|toHTML }}</a>
+```
+
+### `toHTML`
+
+Takes some text and makes it safe to use in a HTML document. This can also
+be seen being used in the example given above.
+
+### `title`
+
+Takes a guide entry and emits a suitable title for it. For example:
+
+```jinja
+{% block title %}{{ entry|title }}{% endblock %}
+```
+
+The title will be rendered as path of sorts, which will include the title of
+the guide, the title of the menu the entry relates to, and the prompt from
+the menu that the entry relates to. For example:
+
+```
+MrDebug for CA-Clipper Ver 1.20.147ß » Reference » Menus
+```
+
+!!! tip
+
+    As a special case, if you pass `None` as the entry `title` will simply
+    output the title of the guide.
+
+## Getting help
+
+If you need some help using `ng2web`, or have ideas for improvements, please
+feel free to drop by [the
+discussions](https://github.com/davep/ng2web/discussions) and ask or
+suggest. If you believe you've found a bug please feel free to [raise an
+issue](https://github.com/davep/ng2web/issues).
+
+[//]: # (index.md ends here)
diff --git a/mkdocs.yml b/mkdocs.yml
new file mode 100644
index 0000000..245a12f
--- /dev/null
+++ b/mkdocs.yml
@@ -0,0 +1,39 @@
+site_name: ng2web
+docs_dir: docs/
+repo_url: https://github.com/davep/ng2web
+
+nav:
+  - "Guide": index.md
+
+markdown_extensions:
+  - admonition
+  - pymdownx.snippets
+  - pymdownx.superfences:
+      custom_fences:
+        - name: bash
+          class: bash
+          validator: !!python/name:markdown_exec.validator
+          format: !!python/name:markdown_exec.formatter
+
+plugins:
+  - markdown-exec
+
+theme:
+  name: material
+  features:
+    - content.code.copy
+  palette:
+    - media: "(prefers-color-scheme: light)"
+      scheme: default
+      accent: purple
+      toggle:
+        icon: material/weather-sunny
+        name: Switch to dark mode
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      primary: black
+      toggle:
+        icon: material/weather-night
+        name: Switch to light mode
+
+### mkdocs.yml ends here
diff --git a/pyproject.toml b/pyproject.toml
index af890da..8b2ccb1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ classifiers = [
 ]
 
 [project.urls]
-Homepage = "https://github.com/davep/ng2web"
+Homepage = "https://blog.davep.org/ng2web/"
 Repository = "https://github.com/davep/ng2web"
 Documentation = "https://blog.davep.org/ng2web/"
 Source = "https://github.com/davep/ng2web"
@@ -64,6 +64,8 @@ managed = true
 dev-dependencies = [
     "pre-commit>=4.2.0",
     "mypy>=1.15.0",
+    "mkdocs-material>=9.6.9",
+    "markdown-exec>=1.10.2",
 ]
 
 [tool.hatch.metadata]
diff --git a/requirements-dev.lock b/requirements-dev.lock
index 76ab54f..50fcd26 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -10,19 +10,53 @@
 #   universal: false
 
 -e file:.
+babel==2.17.0
+    # via mkdocs-material
+backrefs==5.8
+    # via mkdocs-material
+certifi==2025.1.31
+    # via requests
 cfgv==3.4.0
     # via pre-commit
+charset-normalizer==3.4.1
+    # via requests
+click==8.1.8
+    # via mkdocs
+colorama==0.4.6
+    # via mkdocs-material
 distlib==0.3.9
     # via virtualenv
 filelock==3.18.0
     # via virtualenv
+ghp-import==2.1.0
+    # via mkdocs
 identify==2.6.9
     # via pre-commit
+idna==3.10
+    # via requests
 jinja2==3.1.6
+    # via mkdocs
+    # via mkdocs-material
     # via ng2web
+markdown==3.7
+    # via mkdocs
+    # via mkdocs-material
+    # via pymdown-extensions
+markdown-exec==1.10.2
 markupsafe==3.0.2
     # via jinja2
+    # via mkdocs
     # via ng2web
+mergedeep==1.3.4
+    # via mkdocs
+    # via mkdocs-get-deps
+mkdocs==1.6.1
+    # via mkdocs-material
+mkdocs-get-deps==0.2.0
+    # via mkdocs
+mkdocs-material==9.6.9
+mkdocs-material-extensions==1.3.1
+    # via mkdocs-material
 mypy==1.15.0
 mypy-extensions==1.0.0
     # via mypy
@@ -30,14 +64,42 @@ ngdb==0.12.0
     # via ng2web
 nodeenv==1.9.1
     # via pre-commit
+packaging==24.2
+    # via mkdocs
+paginate==0.5.7
+    # via mkdocs-material
+pathspec==0.12.1
+    # via mkdocs
 platformdirs==4.3.7
+    # via mkdocs-get-deps
     # via virtualenv
 pre-commit==4.2.0
+pygments==2.19.1
+    # via mkdocs-material
+pymdown-extensions==10.14.3
+    # via markdown-exec
+    # via mkdocs-material
+python-dateutil==2.9.0.post0
+    # via ghp-import
 pyyaml==6.0.2
+    # via mkdocs
+    # via mkdocs-get-deps
     # via pre-commit
+    # via pymdown-extensions
+    # via pyyaml-env-tag
+pyyaml-env-tag==0.1
+    # via mkdocs
+requests==2.32.3
+    # via mkdocs-material
+six==1.17.0
+    # via python-dateutil
 typing-extensions==4.12.2
     # via mypy
     # via ng2web
     # via ngdb
+urllib3==2.3.0
+    # via requests
 virtualenv==20.29.3
     # via pre-commit
+watchdog==6.0.0
+    # via mkdocs