diff --git a/benchmark/README.md b/benchmark/README.md
index 7717383905c4712c19c5fba0c601e1cd32375776..64d5978216805100316e9998ddb7b17b586fa366 100644
--- a/benchmark/README.md
+++ b/benchmark/README.md
@@ -25,4 +25,34 @@ then
 
 ```bash
 summarize summarize regex-17088
-```
\ No newline at end of file
+```
+
+## Notes
+
+Node version:
+
+```
+JSON
+TOKENIZING 100210 lines using grammar source.js
+Oniguruma: 216 ms., Onigasm: 117 ms. (1.8x faster)
+```
+
+we used:
+
+```
+➜  benchmark git:(master) ✗ cargo run benchmark
+   Compiling benchmark v0.1.0 (/Users/fdhuang/repractise/scie/benchmark)
+    Finished dev [unoptimized + debuginfo] target(s) in 1.26s
+     Running `/Users/fdhuang/repractise/scie/target/debug/benchmark benchmark`
+
+
+TOKENIZING 100210 length using grammar source.js 107204 ms
+```
+
+with release version:
+
+```
+/Users/fdhuang/repractise/scie/target/release/benchmark
+
+TOKENIZING 100210 length using grammar source.js 10306 ms
+```