diff --git a/docs/custom.md b/docs/custom.md
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--- /dev/null
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@@ -0,0 +1,83 @@
+# Customize your uMap installation
+
+
+When running your own uMap, you may want to changed its appearance, for example
+you want your own logo on the home page, or you want to apply some design, or
+you want to add some tracking (but anonymous!) script…
+
+This is done by overriding templates, CSS and images and telling uMap about
+that.
+So basically you'll have your own templates and/or statics directories where
+you will put the templates or statics you want to control (and only those).
+
+Inside thore directory, you need to respect the exact relative path of the
+templates or statics you are adding, relatively to the
+[templates](https://github.com/umap-project/umap/tree/master/umap/templates)
+and
+[static](https://github.com/umap-project/umap/tree/master/umap/static)
+roots in the uMap structure.
+For example, if you want to control the logo, you will add your own static with
+the relative path `umap/img/logo.svg`.
+
+The same apply to any file inside `umap/templates` and `umap/statics`.
+
+## Settings
+
+- `UMAP_CUSTOM_TEMPLATES` (`path`): points to the directory where the custom
+ templates are stored
+- `UMAP_CUSTOM_STATICS` (`path`): points to the directory where the custom
+ templates are stored
+
+
+## Example
+
+Let's say we want to customize the home page, with a custom header, a custom
+logo, and some CSS adjustments.
+
+For this we need to control at least two files:
+
+- `umap/navigation.html`
+- `umap/theme.css`
+
+Let's create one templates directory:
+
+    mkdir -p /srv/umap/custom/templates/
+
+And one static directory:
+
+    mkdir -p /srv/umap/custom/static/
+
+Now let's create our custom navigation file:
+
+    vim /srv/umap/custom/templates/umap/navigation.html
+
+We certainly want to copy-paste the
+[original one](https://github.com/umap-project/umap/blob/master/umap/templates/umap/navigation.html)
+to adapt it.
+
+Now let's add our custom logo, with whatever path inside the static dir, given
+we'll customize also the CSS:
+
+    mv mylogo.png /srv/umap/custom/static/umap/mylogo.png
+
+And then let's add some custom rules, for example the one to load our logo:
+
+```css
+.umap-nav h1 a {
+    background-image: url("./img/mylogo.png");
+}
+```
+
+And we want the header to be red:
+
+```css
+.umap-nav {
+    background-color: red;
+}
+```
+
+And so on!
+
+See also
+[https://github.com/etalab/cartes.data.gouv.fr](https://github.com/etalab/cartes.data.gouv.fr)
+for an example of customization.
diff --git a/mkdocs.yml b/mkdocs.yml
index 8f69ea69..aed0a972 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -5,4 +5,5 @@ pages:
 - Contributing: contributing.md
 - how-tos:
   - Ubuntu from scratch: ubuntu.md
+  - Customize your uMap style: custom.md
 theme: readthedocs
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