diff --git a/slides/.gitignore b/slides/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..91e17a152282ed6dfc0d3eae137860db59e11550
--- /dev/null
+++ b/slides/.gitignore
@@ -0,0 +1 @@
+mermaid-filter.err