diff --git a/book.toml b/book.toml
index 748cd75290ceb74fd2ee9fcd02af49456c6c337b..c8280794e20fd6103701d7aeb41e8e18c3455aa7 100644
--- a/book.toml
+++ b/book.toml
@@ -43,5 +43,6 @@ toc = true
 output_name = "Infrastructure Docker Swarm"
 engine = "wkhtmltopdf"
 fontsize = "10pt"
+papersize = "a4"