diff --git a/04/README.md b/04/README.md
new file mode 100644
index 0000000..108fbc1
--- /dev/null
+++ b/04/README.md
@@ -0,0 +1,3 @@
+# day 4 (actually day 9, oops)
+
+put data in /tmp/04; just ~~add water~~ execute the scripts