diff --git a/articles/ui/.gitignore b/articles/ui/.gitignore
index 7df13cdff..9679a9a8b 100644
--- a/articles/ui/.gitignore
+++ b/articles/ui/.gitignore
@@ -4,3 +4,4 @@
 *.fdb_latexmk
 *.aux
 *.log
+*.pdf
diff --git a/contrib/.gitignore b/contrib/.gitignore
new file mode 100644
index 000000000..48920c230
--- /dev/null
+++ b/contrib/.gitignore
@@ -0,0 +1 @@
+coinsim.js