diff --git a/docs/_templates/layout.html b/docs/_templates/layout.html
--- a/docs/_templates/layout.html
+++ b/docs/_templates/layout.html
@@ -16,6 +16,27 @@
 <!-- End Matomo Code -->
 {% endblock %}
 
+
+{# copied from sphinx_rtd_theme/layout.html, with the extra System Administration link #}
+{%- block menu %}
+  {%- set toctree = toctree(maxdepth=theme_navigation_depth|int,
+                            collapse=theme_collapse_navigation|tobool,
+                            includehidden=theme_includehidden|tobool,
+                            titles_only=theme_titles_only|tobool) %}
+  {%- if toctree %}
+    {{ toctree }}
+  {%- else %}
+    <!-- Local TOC -->
+    <div class="local-toc">{{ toc }}</div>
+  {%- endif %}
+
+  <hr />
+
+  <ul>
+      <li class="toctree-l1"><a href="../sysadm/">System Administration</a></li>
+  </ul>
+{%- endblock %}
+
 {% block content %}
   <div class="swh-top-bar">
     <ul>
diff --git a/docs/index.rst b/docs/index.rst
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -51,10 +51,14 @@
 
 * :ref:`roadmap-2021`
 
-Engineering
------------
-
-* :ref:`Infrastructure <swh-sysadm:infrastructure>`
+System Administration
+---------------------
+
+* :ref:`Network Infrastructure <swh-sysadm:infrastructure>`
+* :ref:`swh-sysadm:mirror` → learn what a Software Heritage mirror is and how to set up
+  one
+* :ref:`Keycloak <swh-sysadm:keycloak>` → learn how to use Keycloak,
+  the authentication system used by |swh|'s web interface and public APIs
 
 Components
 ----------
diff --git a/swh/docs/sphinx/conf.py b/swh/docs/sphinx/conf.py
--- a/swh/docs/sphinx/conf.py
+++ b/swh/docs/sphinx/conf.py
@@ -153,6 +153,7 @@
     "infrastructure/network.html": "../../sysadm/network-architecture/index.html",
     "infrastructure/service-urls.html": "../../sysadm/network-architecture/service-urls.html",  # noqa
     "architecture": "architecture/overview.html",
+    "architecture/mirror": "../../sysadm/mirror-operations/index.html",
     "keycloak": "../../sysadm/user-management/keycloak/index.html",
     "mirror": "architecture/mirror.html",
     "users": "user",
diff --git a/sysadm/_templates/layout.html b/sysadm/_templates/layout.html
new file mode 100644
--- /dev/null
+++ b/sysadm/_templates/layout.html
@@ -0,0 +1,19 @@
+{# copied from sphinx_rtd_theme/layout.html, with the extra "Development Documentation" link #}
+{%- block menu %}
+  {%- set toctree = toctree(maxdepth=theme_navigation_depth|int,
+                            collapse=theme_collapse_navigation|tobool,
+                            includehidden=theme_includehidden|tobool,
+                            titles_only=theme_titles_only|tobool) %}
+  {%- if toctree %}
+    {{ toctree }}
+  {%- else %}
+    <!-- Local TOC -->
+    <div class="local-toc">{{ toc }}</div>
+  {%- endif %}
+
+  <hr />
+
+  <ul>
+      <li class="toctree-l1"><a href="../devel/">Development Documentation</a></li>
+  </ul>
+{%- endblock %}
diff --git a/sysadm/mirror-operations/index.rst b/sysadm/mirror-operations/index.rst
--- a/sysadm/mirror-operations/index.rst
+++ b/sysadm/mirror-operations/index.rst
@@ -4,6 +4,8 @@
 Mirror Operations
 =================
 
+.. _mirror:
+
 Description
 -----------