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diff --git a/hurd/translator/ext2fs/hurd-specific_extensions.mdwn b/hurd/translator/ext2fs/hurd-specific_extensions.mdwn
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--- a/hurd/translator/ext2fs/hurd-specific_extensions.mdwn
+++ b/hurd/translator/ext2fs/hurd-specific_extensions.mdwn
@@ -1,4 +1,4 @@
-[[!meta copyright="Copyright © 2012 Free Software Foundation, Inc."]]
+[[!meta copyright="Copyright © 2012, 2013 Free Software Foundation, Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
@@ -21,3 +21,13 @@ License|/fdl]]."]]"""]]
<antrik> well, also a fourth set of permission bits, and an "author" field
<braunr> right
<antrik> both very obscure features that better never existed...
+
+The fourth set of permission bits is for unknown users.
+
+In order to take advantage of these features, the owner/creator of the
+partition must be set to *hurd*. `mke2fs`, unless specifically overridden on
+the command line (`-o hurd`, for example), will set the default to whatever
+system it is running on. At least the root filesystem must be of *hurd* type,
+as it has to store various passive translator settings. Even if a file system
+is not of the native type, others may still use it; they just may not be able
+to use certain extensions.