diff --git a/README.md b/README.md
index bd37f5f..cc054d7 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,12 @@
 # simple-dict-server
 database["key"]="value" with tea encryption.
 
-# Compile
-You should first clone this project into a system with cmake & libpthread installed.
-If you plan to compile it on Windows, you should edit the source code and transform socket/thread/file libraries into Windows version.
+## Prepare
+Install [simple-crypto](https://github.com/fumiama/simple-crypto) and [simple-protobuf](https://github.com/fumiama/simple-protobuf) into `/usr/local` according to their README.
+
+## Compile
+Clone this project into a system with cmake & libpthread installed.
+If you plan to compile it on Windows, you ought to edit the source code and transform socket/thread/file libraries into a Windows version.
 ```bash
 git clone https://github.com/fumiama/simple-dict-server.git
 ```
@@ -15,27 +18,30 @@ mkdir build
 Use `cmake` command to generate files for `make` automatically.
 ```bash
 cd build
-cmake ../
+cmake ..
 ```
 Use `make` to generate executable binary files named `simple-dict-server` and `simple-dict-client` in `./build` directory.
 ```bash
 make
 ```
-Then you should install [simple-crypto](https://github.com/fumiama/simple-crypto) and [simple-protobuf](https://github.com/fumiama/simple-protobuf) by the same way.
+Optional: Use `make install` to install `simple-dict-server` into `/usr/local/bin`.
 
-# Execute
+## Execute
 Start server on localhost using the commands below.
 ```bash
 chmod +x simple-dict-server simple-dict-client
-./simple-dict-server -d 7777 1 ./dict.sp ./cfg.sp    # use -d to start as daemon
+Usage:
+./simple-dict-server [-d] listen_port dict_file [config_file | -]
+        -d: As daemon
+        - : Read config from env SDS_PWD & SDS_SPS
 ```
-`cfg.sp`is generated by `cfgwriter`, or you can pass config by setting env `SDS_PWD` and `SDS_SPS`.
+`cfg.sp`is generated by `cfgwriter`, otherwise you can pass config by setting env `SDS_PWD` and `SDS_SPS`.
 
 Open another shell to connect to it.
 ```bash
 ./simple-dict-client 127.0.0.1 7777
 ```
-Now you have connected to the server. The default access passwords is in `client.c` and you can modify the password in source code as you like. Please note that the server will only wait `10` seconds for a response after the last communication. The box below shows how to control the server to accompilsh basic add/del/find/edit operations.
+Now you have connected to the server. The default access passwords is in `client.c` and you can modify the password in source code as you like. Please note that the server will only wait `4` seconds for a response after the last communication. The box below shows how to control the server to accompilsh basic add/del/find/edit operations.
 
 |  cmd  |  data  |  description  |  reply  |
 |  ----  | ----  | ----  | ----- |
@@ -51,105 +57,10 @@ Now you have connected to the server. The default access passwords is in `client
 - Whenever the reply is "erro", it indicates that the server has some troubles, which means that you shuold end the conversation and retry later.
 
 A cmd sequence example is as below
-```bash
-get:test
-set:test
-dat:测试
-get:test
-del:test
-get:test
-end
-```
-The client output is
-```bash
-break!
-Get sockfd
-Connected to server
-Thread create succeeded
-Enter command:get:test
-Send data succeed.
-recv ack: null
-Enter command:set:test
-Send data succeed.
-recv ack: data
-Enter command:dat:测试
-Send data succeed.
-recv ack: succ
-Enter command:get:test
-Send data succeed.
-recv ack: 测试
-Enter command:del:test
-Send data succeed.
-recv ack: succ
-Enter command:get:test
-Send data succeed.
-recv ack: null
-Enter command:end
-Send data succeed.
-```
-The server output meanwhile is
-```bash
-Bind server success!
-Listening....
-Ready for accept, waitting...
-Next thread is No.0
-Accept client ::ffff:127.0.0.1:51296
-Creating thread succeeded
-Ready for accept, waitting...
 
-Connected to the client.
-Next thread is No.1
-Creating timer thread succeeded
-Wait sec: 2, max: 10
-[normal] Get 34 bytes packet with cmd: 0, data: test
-Close dict
-Send data: null
-Wait sec: 0, max: 10
-Wait sec: 2, max: 10
-Wait sec: 4, max: 10
-[super] Get 34 bytes packet with data: test
-Send data: data
-Wait sec: 1, max: 10
-Wait sec: 3, max: 10
-[super] Get 34 bytes packet with data: 测试
-Data copy to dict succ
-Set data: dict[test]=测试
-Close dict
-Send data: succ
-Wait sec: 0, max: 10
-Wait sec: 2, max: 10
-[normal] Get 34 bytes packet with cmd: 0, data: test
-Close dict
-Send data: 测试
-Wait sec: 0, max: 10
-Wait sec: 2, max: 10
-[super] Get 34 bytes packet with data: test
-Close dict
-Send data: succ
-Wait sec: 0, max: 10
-Wait sec: 2, max: 10
-[normal] Get 34 bytes packet with cmd: 0, data: test
-Close dict
-Send data: null
-Wait sec: 0, max: 10
-[normal] Get 34 bytes packet with cmd: 4, data: fill
-Conversation end
+https://user-images.githubusercontent.com/41315874/163713542-5d8c6eda-2ff4-4a09-8a0e-8865292c0022.mp4
 
-Start killing.
-Close accept.
-Free data.
-Close dict
-Finish killing.
-Wait sec: 0, max: 10
-Call kill thread
-Start killing.
-Close dict
-Finish killing.
-Free timer
-Finish calling kill thread
-```
-
-# Android Client for simple-dict-server
+## Android Client for simple-dict-server
 There is also an [Android Client](https://github.com/fumiama/simple-dict-android) for simple-dict-server. Just install the apk file downloaded from release page and click `config` icon to set your server address using the format
 ```
 127.0.0.1:7777_password
diff --git a/client.c b/client.c
index e29f193..3b939de 100644
--- a/client.c
+++ b/client.c
@@ -107,12 +107,7 @@ void getMessage(void *p) {
                 #ifdef DEBUG
                     printf("[normal] Get %u bytes packet with data: %s\n", offset, cp->data);
                 #endif
-                switch(cp->cmd) {
-                    case CMDACK:
-                        printf("recv ack: %s\n", cp->data);
-                    break;
-                    default: break;
-                }
+                printf("[%d] recv ack: %s\n", (int)cp->cmd, cp->data);
             }
             if(offset > c) {
                 offset -= c;