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diff --git a/README.md b/README.md
index 874ac56..33288c8 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,16 @@
 
     go run ./cmd/koushin imaps://mail.example.org:993 smtps://mail.example.org:465
 
+See `-h` for more information.
+
+## Themes
+
+They should be put in `public/themes/<name>/`.
+
+Templates in `public/themes/<name>/*.html` override default templates in
+`public/*.html`. Assets in `public/themes/<name>/assets/*` are served by the
+HTTP server at `themes/<name>/assets/*`.
+
 ## License
 
 MIT