diff --git a/doc/development/structure.rst b/doc/development/structure.rst
index 3fa3bf1282..64ade215da 100644
--- a/doc/development/structure.rst
+++ b/doc/development/structure.rst
@@ -18,3 +18,43 @@ tixlcontrol/
 
 tixlpresale/
     This is the django app containing the frontend for users buying tickets.
+
+helpers/
+    Helpers contain a very few modules providing workarounds for low-level flaws in
+    Django or installed 3rd-party packages, like a filter to combine the ``lessc``
+    preprocessor with ``django-compressor``'s URL rewriting.
+
+Language files
+--------------
+The language files live in ``locale/*/LC_MESSAGES/``.
+
+Static files
+-------------
+
+LESS source code
+^^^^^^^^^^^^^^^^
+
+We use less as a preprocessor for CSS. Our own less code is built in the same
+step as Bootstrap and FontAwesome, so their mixins etc. are fully available.
+
+tixlcontrol
+    tixlcontrol has two main LESS files, ``tixlcontrol/static/tixlcontrol/less/main.less`` and
+    ``tixlcontrol/static/tixlcontrol/less/auth.less``, importing everything else.
+
+3rd-party assets
+^^^^^^^^^^^^^^^^
+
+Bootstrap
+    Bootstrap lives as a git submodule at ``tixlbase/static/bootstrap/``
+
+Font Awesome
+    Font Awesome lives as a git submodule at ``tixlbase/static/fontawesome/``
+
+jQuery
+    jQuery lives as a single JavaScript file in ``tixlbase/static/jquery/js/``
+
+jQuery plugin: Django formsets
+    Our own modified version of `django-formset-js`_ is available as an independent
+    django app and installed via pip.
+
+.. _django-formset-js: https://github.com/tixl/django-formset-js