diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..24a6928
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,20 @@
+# for Racket
+compiled/
+*~
+
+# for Mac OS X
+.DS_Store
+.AppleDouble
+.LSOverride
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear on external disk
+.Spotlight-V100
+.Trashes
+doc/*
+scribblings/*.css
+scribblings/*.js
+scribblings/*.html
\ No newline at end of file