diff --git a/exp/README.md b/exp/README.md
index 5417cd5..1de66be 100644
--- a/exp/README.md
+++ b/exp/README.md
@@ -5,3 +5,5 @@
 ```
 go run bleve.go
 ```
+
+You may need to `rm -rf *.bleve` to clean up previous index runs.