diff --git a/sermon-a4.css b/sermon-a4.css
index 3b871ca..3857b5d 100644
--- a/sermon-a4.css
+++ b/sermon-a4.css
@@ -1,11 +1,17 @@
 /* @theme sermon-a4
 author: simonpipe (codeberg.org/simonpipe/)
 License: MIT
-Inspired by "a4-clean.css" by stanfrdb
 
-Standalone A4/Booklet theme based on Marp 'base'.
+This theme is optimized for A4 printing.
+Inspired by "a4-clean.css" by stanfrdb (https://github.com/stanfrbd/A4-marp/tree/main)
+
+Usage:
+- Default: Standard A4 layout with 12pt font size.
+- Class 'booklet': Scales the layout to 18pt for easy-to-read booklet printing.
+  (Set 'class: booklet' in your Markdown YAML header)
 */
 
+
 @import "base";
 @import url("https://fonts.googleapis.com/css2?family=Ubuntu+Mono:ital,wght@0,400;0,700;1,400;1,700&family=Ubuntu:ital,wght@0,300;0,400;0,500;0,700;1,300;1,400;1,500;1,700&display=swap");