diff --git a/.gitignore b/.gitignore
index 53aab70..4b724a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,9 @@
 .Rproj.user/
 /*_files
 
+# supporting files
+brainstorming/
+
 # produced vignettes
 vignettes/*.html
 vignettes/*.pdf