diff --git a/.gitignore b/.gitignore
index 8afec52..8421917 100644
--- a/.gitignore
+++ b/.gitignore
@@ -207,3 +207,6 @@ bundle
 crowbook/wtf-handbook.epub
 crowbook/wtf-handbook.html
 crowbook/wtf-handbook.pdf
+
+# Plantuml binary
+plantuml.jar