diff --git a/src/calibre/linux.py b/src/calibre/linux.py
index d0ac82e319..331783c775 100644
--- a/src/calibre/linux.py
+++ b/src/calibre/linux.py
@@ -313,7 +313,7 @@ class PostInstall:
             with open(os.path.join(base, '95-calibre.rules'), 'wb') as udev:
                 self.manifest.append(udev.name)
                 udev.write('''# Sony Reader PRS-500\n'''
-                        '''BUS=="usb", SYSFS{idProduct}=="029b", SYSFS{idVendor}=="054c", MODE="660", GROUP="%s"\n'''%(group,)
+                        '''SUBSYSTEMS=="usb", SYSFS{idProduct}=="029b", SYSFS{idVendor}=="054c", MODE="660", GROUP="%s"\n'''%(group,)
                         )
         except:
             if self.opts.fatal_errors:
diff --git a/src/calibre/manual/develop.rst b/src/calibre/manual/develop.rst
index f061100f6d..ca067e45bc 100644
--- a/src/calibre/manual/develop.rst
+++ b/src/calibre/manual/develop.rst
@@ -152,7 +152,7 @@ Linux development environment
 used in windows and OS X. Alternatively, you can install |app| from source. Instructions for setting up a development
 environment from source are in the INSTALL file in the source tree. Here we will address using the binary a runtime.
 
-Install the |app| using the binary installer. The opena  terminal and change to the previously checked out |app| code directory, for example::
+Install the |app| using the binary installer. Then open a terminal and change to the previously checked out |app| code directory, for example::
 
     cd /home/kovid/work/calibre