diff --git a/main.tex b/main.tex
index fd38ba5..b50dfda 100644
--- a/main.tex
+++ b/main.tex
@@ -1,5 +1,5 @@
 %%%% This is the general thesis/project report template for most users
-\documentclass[showtrims, a4paper]{rubook}
+\documentclass[showtrims, b5paper]{rubook}
 %% RU Book options (subclass of memoir)
 %% a4paper or b5paper(default):  paper stock size.
 %%     If A4, show cut lines.  If b5, no cut lines.