diff --git a/README.md b/README.md
index 6552b57..5bf303b 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,15 @@
 # rotate-puts
 
-Rotate outputs from std in
+Rotate outputs from std in or assigned file
 
 Usage:
 ```shell
 command | rotate-puts
 ```
+
+Use `mkfifo`:
+```shell
+mkfido test-fifo
+rotate-puts --file test-fifo
+command > test-fifo
+```