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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -2,3 +2,28 @@
 Draw sexp.
 
 ![fib.png](https://raw.githubusercontent.com/wiki/tojoqk/pict-sexp/images/fib.png)
+
+# INSALL
+```
+raco pkg install https://github.com/tojoqk/pict-sexp.git
+```
+
+# USAGE
+Save as "pict-fib.png".
+```
+#lang racket
+(require pict)
+(require pict-sexp)
+
+(define pict-fib
+  (pict-sexp
+   '(define (fib n)
+      (cond
+        [(= n 0) 0]
+        [(= n 1) 1]
+        [else
+         (+ (fib (- n 1))
+            (fib (- n 2)))]))))
+
+(send (pict->bitmap pict-fib) save-file "pict-fib.png" 'png)
+```