diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0fb1808
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "doc/_themes/flask-sphinx-themes"]
+	path = doc/_themes/flask-sphinx-themes
+	url = https://github.com/mitsuhiko/flask-sphinx-themes.git
diff --git a/doc/_themes/flask-sphinx-themes b/doc/_themes/flask-sphinx-themes
new file mode 160000
index 0000000..1cc4468
--- /dev/null
+++ b/doc/_themes/flask-sphinx-themes
@@ -0,0 +1 @@
+Subproject commit 1cc44686f0f9dad27cce2c9d16cf42f97bc87dbd
diff --git a/doc/client/index.rst b/doc/client/index.rst
new file mode 100644
index 0000000..079dc30
--- /dev/null
+++ b/doc/client/index.rst
@@ -0,0 +1,79 @@
+About the API
+==============
+
+A few things you must know before diving into the API:
+
+Everything is JSON
+-------------------
+
+Every request should have a JSON payload; anything else will be refused and
+return a 400 status. For example:
+
+.. sourcecode:: http
+
+   POST /randomendpoint
+   Host: example.com
+   Accept: text/html
+   Content-Type: application/x-www-form-urlencoded
+
+   field1=value&field2=value
+
+The response will always be:
+
+.. sourcecode:: http
+
+   HTTP/1.1 400 Bad Request
+   Content-Type: text/json
+
+   { "status": "ERROR", "message": "Request MUST be in JSON format" }
+
+If instead you do a proper JSON request with:
+
+.. sourcecode:: http
+
+   POST /randomendpoint
+   Host: example.com
+   Content-type: text/json
+
+   { "field1": "value", "field2": "value" }
+
+Then everything would go fine.
+
+Standard responses
+-------------------
+
+Responses will always have a ``status`` parameter with the result of the
+operation -- more fields may be also returned, depending on the request.
+
+Successful requests with have the value ``OK`` for ``status`` -- and, again,
+more fields may be returned in most cases. Also, the HTTP status code will
+**always** be 200.
+
+In case of failure, ``status`` will have the text ``ERROR`` (in all caps) and
+a ``message`` field will have the reason for the error -- and, as success, it
+may contain more fields with information about the error. For different errors
+in the operation there will be a different HTTP status. We tried as hard as
+possible to give each error a meaningful HTTP status, even if this sometimes
+wouldn't make much sense -- for example, if you try to change the ownership of
+a group and the group doesn't exist, you'll get a 404 status; if the new owner
+doesn't exist, instead of a proper 404, we will return a 412 status, not
+because there is a precondition error in the headers, but because we need 
+a different code to point that the new user does not exist.
+
+Redirects
+----------
+
+All URLs must end with "/"; if you forget to add them in the URL, you'll
+receive a redirect to the path with "/".
+
+API
+----
+
+.. toctree::
+   :maxdepth: 2
+
+   users_and_tokens
+
+.. autoflask:: luncho.server:app
+   :blueprints: token, users
+   :undoc-endpoints: static
diff --git a/doc/client/users_and_tokens.rst b/doc/client/users_and_tokens.rst
new file mode 100644
index 0000000..2cf65a7
--- /dev/null
+++ b/doc/client/users_and_tokens.rst
@@ -0,0 +1,21 @@
+Users and Tokens
+=================
+
+Token
+------
+
+All requests require an access token to be valid. The token is valid for a
+whole day and, unless you don't have the access token or it expired, you
+should use this request to get a valid token:
+
+.. autoflask:: luncho.server:app
+   :blueprints: token
+   :undoc-endpoints: static
+
+
+Users
+------
+
+.. autoflask:: luncho.server:app
+   :blueprints: users
+   :undoc-endpoints: static
diff --git a/doc/conf.py b/doc/conf.py
index 3365bb7..f2766c2 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -19,6 +19,7 @@ import os
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('..'))
+sys.path.append(os.path.abspath('_themes/flask-sphinx-themes'))
 
 # -- General configuration ------------------------------------------------
 
@@ -103,7 +104,8 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+#html_theme = 'default'
+html_theme = 'flask'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -111,7 +113,7 @@ html_theme = 'default'
 #html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
+html_theme_path = ['_themes/flask-sphinx-themes/']
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
@@ -187,22 +189,22 @@ htmlhelp_basename = 'Luncho-odoc'
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
+    # The paper size ('letterpaper' or 'a4paper').
+    #'papersize': 'letterpaper',
 
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
+    # The font size ('10pt', '11pt' or '12pt').
+    #'pointsize': '10pt',
 
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
+    # Additional stuff for the LaTeX preamble.
+    #'preamble': '',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-  ('index', 'Luncho-o.tex', u'Luncho-o Documentation',
-   u'Julio Biason', 'manual'),
+    ('index', 'Luncho-o.tex', u'Luncho-o Documentation',
+     u'Julio Biason', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -245,9 +247,9 @@ man_pages = [
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-  ('index', 'Luncho-o', u'Luncho-o Documentation',
-   u'Julio Biason', 'Luncho-o', 'One line description of project.',
-   'Miscellaneous'),
+    ('index', 'Luncho-o', u'Luncho-o Documentation',
+     u'Julio Biason', 'Luncho-o', 'Lunch for groups.',
+     'Miscellaneous'),
 ]
 
 # Documents to append as an appendix to all manuals.