diff --git a/.gitignore b/.gitignore
index 75a9d67f773cf0b2e489ed07b764abef6de6d3ed..540ee1bd2a406daec26a80541912d9524f5594ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 .vscode
 *.html
 *.xopp
+mermaid-filter.err