diff --git a/99-openfpgaloader.rules b/99-openfpgaloader.rules
new file mode 100644
index 0000000..575d551
--- /dev/null
+++ b/99-openfpgaloader.rules
@@ -0,0 +1,21 @@
+# Copy this file to /etc/udev/rules.d/
+
+ACTION!="add|change", GOTO="openfpgaloader_rules_end"
+SUBSYSTEM!="usb|tty|hidraw", GOTO="openfpgaloader_rules_end"
+
+# Original FT232/FT245 VID:PID
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", MODE="664", GROUP="plugdev"
+
+# Original FT2232 VID:PID
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6010", MODE="664", GROUP="plugdev"
+
+# Original FT4232 VID:PID
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6011", MODE="664", GROUP="plugdev"
+
+# Original FT232H VID:PID
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6014", MODE="664", GROUP="plugdev"
+
+# Original FT231X VID:PID
+ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", MODE="664", GROUP="plugdev"
+
+LABEL="openfpgaloader_rules_end"
diff --git a/README.md b/README.md
index 15deb98..fe65bf8 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,20 @@ $ sudo make install
 The default install path is `/usr/local`, to change it, use
 `-DCMAKE_INSTALL_PREFIX=myInstallDir` in cmake invokation.
 
+## access right
+
+By default, users have no access to converters. A rule file
+(*99-openfpgaloader.rules*) for *udev* is provided at the root directory
+of this repository. These rules set access right and group (*plugdev*)
+when a converter is plugged.
+
+```bash
+$ sudo cp 99-openfpgaloader.rules /etc/udev/rules.d/
+$ sudo udevadm control --reload-rules && udevadm trigger # force udev to take new rule
+$ sudo usermod -a YourUserName -G plugdev # add user to plugdev group
+```
+After that you need to unplug and replug your device.
+
 ## Usage
 
 ```bash