diff --git a/README.md b/README.md
index a6dfdc7..d765e1c 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,15 @@
-# grassmudhorse.rs
 
 Grass Mud Horse in Rust
 
-compile:
+# Intrduction
+
+Grass Mud Horse Language Spec - [https://playsecurity.org/rawfile/grass_mud_horse_language_specification.md](https://playsecurity.org/rawfile/grass_mud_horse_language_specification.md)
+
+![](https://grassmudhorse.org/resources/gmh-lang.jpg)
+
+# Compile
+
+compile grassmudhorse.rs:
 ```shell
 $ cargo b
 
@@ -11,15 +18,17 @@ OR
 $ cargo b --release
 ```
 
+# Usage
+
 help:
 ```shell
-$ ./target/debug/grassmudhorse -h
+$ grassmudhorse -h
 grassmudhorse.rs v0.1
 ```
 
 execute from file:
 ```shell
-$ ./target/debug/grassmudhorse print-110.gmh 
+$ grassmudhorse print-110.gmh 
 1
 2
 3
@@ -34,7 +43,7 @@ $ ./target/debug/grassmudhorse print-110.gmh
 
 execute from stdin:
 ```shell
-$ cat print-110.gmh | ./target/debug/grassmudhorse
+$ cat print-110.gmh | grassmudhorse
 1
 2
 3
@@ -47,8 +56,34 @@ $ cat print-110.gmh | ./target/debug/grassmudhorse
 10
 ```
 
+compile:
+```shell
+$ cat plus11.gmh.source 
+push 1
+push 2
+add
+stdoutnum
+push 10
+stdoutchar
+end
+
+
+$ grassmudhorse --compile plus11.gmh.source 
+草草草泥马
+草草草泥草马
+泥草草草
+泥马草泥
+草草草泥草泥草马
+泥马草草
+马马马
+
+
+$ grassmudhorse --compile plus11.gmh.source | grassmudhorse
+3
+```
+
 compile and execute:
 ```shell
-$ ./target/debug/grassmudhorse --compile plus1100.gmh.source | ./target/debug/grassmudhorse
+$ grassmudhorse --compile plus1100.gmh.source | grassmudhorse
 5050
 ```
diff --git a/plus11.gmh.source b/plus11.gmh.source
new file mode 100644
index 0000000..0dac31f
--- /dev/null
+++ b/plus11.gmh.source
@@ -0,0 +1,7 @@
+push 1
+push 2
+add
+stdoutnum
+push 10
+stdoutchar
+end