diff --git a/docs/assets/favicon.ico b/docs/assets/favicon.ico
new file mode 100644
index 0000000..0b483f1
Binary files /dev/null and b/docs/assets/favicon.ico differ
diff --git a/docs/assets/plugrl-mark-on-dark.svg b/docs/assets/plugrl-mark-on-dark.svg
new file mode 100644
index 0000000..959b4e7
--- /dev/null
+++ b/docs/assets/plugrl-mark-on-dark.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="512" height="512"><title>PlugRL</title><defs><mask id="h" maskUnits="userSpaceOnUse" x="0" y="0" width="64" height="64"><rect width="64" height="64" fill="#fff"/><rect x="19.2" y="16" width="6.6" height="20" rx="1.6" transform="rotate(20 22.5 26)" fill="#000"/><path d="M25.30 41.2 H38.70 Q40.00 41.2 40.00 42.50 A8.0 8.0 0 0 1 24.00 42.50 Q24.00 41.2 25.30 41.2 Z" fill="#000"/></mask></defs><path d="M58.50 32.00 L58.49 40.14 L58.44 42.74 L58.37 44.62 L58.27 46.14 L58.14 47.43 L57.97 48.57 L57.78 49.58 L57.56 50.49 L57.30 51.32 L57.02 52.08 L56.70 52.78 L56.35 53.43 L55.96 54.02 L55.53 54.57 L55.07 55.07 L54.57 55.53 L54.02 55.96 L53.43 56.35 L52.78 56.70 L52.08 57.02 L51.32 57.30 L50.49 57.56 L49.58 57.78 L48.57 57.97 L47.43 58.14 L46.14 58.27 L44.62 58.37 L42.74 58.44 L40.14 58.49 L32.00 58.50 L23.86 58.49 L21.26 58.44 L19.38 58.37 L17.86 58.27 L16.57 58.14 L15.43 57.97 L14.42 57.78 L13.51 57.56 L12.68 57.30 L11.92 57.02 L11.22 56.70 L10.57 56.35 L9.98 55.96 L9.43 55.53 L8.93 55.07 L8.47 54.57 L8.04 54.02 L7.65 53.43 L7.30 52.78 L6.98 52.08 L6.70 51.32 L6.44 50.49 L6.22 49.58 L6.03 48.57 L5.86 47.43 L5.73 46.14 L5.63 44.62 L5.56 42.74 L5.51 40.14 L5.50 32.00 L5.51 23.86 L5.56 21.26 L5.63 19.38 L5.73 17.86 L5.86 16.57 L6.03 15.43 L6.22 14.42 L6.44 13.51 L6.70 12.68 L6.98 11.92 L7.30 11.22 L7.65 10.57 L8.04 9.98 L8.47 9.43 L8.93 8.93 L9.43 8.47 L9.98 8.04 L10.57 7.65 L11.22 7.30 L11.92 6.98 L12.68 6.70 L13.51 6.44 L14.42 6.22 L15.43 6.03 L16.57 5.86 L17.86 5.73 L19.38 5.63 L21.26 5.56 L23.86 5.51 L32.00 5.50 L40.14 5.51 L42.74 5.56 L44.62 5.63 L46.14 5.73 L47.43 5.86 L48.57 6.03 L49.58 6.22 L50.49 6.44 L51.32 6.70 L52.08 6.98 L52.78 7.30 L53.43 7.65 L54.02 8.04 L54.57 8.47 L55.07 8.93 L55.53 9.43 L55.96 9.98 L56.35 10.57 L56.70 11.22 L57.02 11.92 L57.30 12.68 L57.56 13.51 L57.78 14.42 L57.97 15.43 L58.14 16.57 L58.27 17.86 L58.37 19.38 L58.44 21.26 L58.49 23.86 Z" fill="#e6eaf0" mask="url(#h)"/><rect x="38.2" y="16" width="6.6" height="20" rx="1.6" transform="rotate(-20 41.5 26)" fill="#1e5bd6"/></svg>
diff --git a/mkdocs.yml b/mkdocs.yml
index 0a0bc61..d471cb9 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -31,6 +31,9 @@ plugins:
         - '**/sitemap.xml'
 theme:
   name: material
+  # The PlugRL mark: the light-plate version, for the dark header bar.
+  logo: assets/plugrl-mark-on-dark.svg
+  favicon: assets/favicon.ico
   features:
     - navigation.tracking
     - navigation.indexes