diff --git a/doc/note/firmware-update b/doc/note/firmware-update
index 386fe8a..d519ded 100644
--- a/doc/note/firmware-update
+++ b/doc/note/firmware-update
@@ -16,7 +16,7 @@ In addition to settings of Gnuk, I create a file
 
    # For updating firmware, permission settings are needed.
    
-   SUBSYSTEMS=="usb", ATTRS{idVendor}=="234b", ATTRS{idProduct}=="0000", \
+   SUBSYSTEMS=="usb", ATTR{idVendor}=="234b", ATTR{idProduct}=="0000", \
        ENV{ID_USB_INTERFACES}=="*:ff0000:*", GROUP="pcscd"
 
 
diff --git a/doc/note/firmware-update-2 b/doc/note/firmware-update-2
index ef0d41d..90022d8 100644
--- a/doc/note/firmware-update-2
+++ b/doc/note/firmware-update-2
@@ -54,7 +54,7 @@ setting).  It should have lines something like: ::
   # Gnuk Token by FSIJ
 
   SUBSYSTEMS=="usb", ACTION=="add", \
-    ATTRS{idVendor}=="234b", ATTRS{idProduct}=="0000", \
+    ATTR{idVendor}=="234b", ATTR{idProduct}=="0000", \
     ENV{ID_SMARTCARD_READER}="1", ENV{ID_SMARTCARD_READER_DRIVER}="gnupg"
 
 I have those lines in /etc/udev/rules.d/69-gnuk.rules.
diff --git a/doc/udev-rules.rst b/doc/udev-rules.rst
index 53541bd..579187a 100644
--- a/doc/udev-rules.rst
+++ b/doc/udev-rules.rst
@@ -37,7 +37,7 @@ When we only install "gnupg2" package for 2.0 (with no "gnupg" package),
 there will be no udev rules (there is a bug report #543217 for this issue).
 In this case, we need something like this in /etc/udev/rules.d/60-gnuk.rules::
 
-    SUBSYSTEMS=="usb", ATTRS{idVendor}=="234b", ATTRS{idProduct}=="0000",   \
+    SUBSYSTEMS=="usb", ATTR{idVendor}=="234b", ATTR{idProduct}=="0000",   \
     ENV{ID_SMARTCARD_READER}="1", ENV{ID_SMARTCARD_READER_DRIVER}="gnupg"
 
 Usually, udev daemon automatically handles for the changes of configuration