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+# NISSYNCD: Automatically rebuild NIS database (in Rust)
+
+The program is designed for computer clusters which share users and groups by NIS, which could watch for `/etc/passwd`, `/etc/shadow`, `/etc/group` and `/etc/gshadow` changing and run `make` in NIS directory automatically.
+
+This program requires you to install `make` before use it.
+
+## Environment variables
+
+You can set a environment variables named `YP_DIRECTORY` to specify the NIS database directory. Default value is `/var/yp`.
+
+## Build & Release
+
+It's recommended to build the source code to `x86_64-unknown-linux-musl` target, that will make the program statically linked, and you could run it everywhere. The file provided in release page is compile to this target.
+
+## systemd intergration
+
+```ini
+# /etc/systemd/system/nissyncd.service
+[Unit]
+Description=Rebuild NIS database automatically.
+
+[Service]
+Type=simple
+# assumes that put the binary file in /usr/local/bin
+ExecStart=/usr/local/bin/nissyncd
+
+[Install]
+WantedBy=multi-user.target
+```
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-hello, world
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