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-rw-r--r--Documentation/filesystems/ext4.txt10
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diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 1b7f9acbcbbe..104322bf378c 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -375,6 +375,16 @@ dioread_nolock locking. If the dioread_nolock option is specified
Because of the restrictions this options comprises
it is off by default (e.g. dioread_lock).
+max_dir_size_kb=n This limits the size of directories so that any
+ attempt to expand them beyond the specified
+ limit in kilobytes will cause an ENOSPC error.
+ This is useful in memory constrained
+ environments, where a very large directory can
+ cause severe performance problems or even
+ provoke the Out Of Memory killer. (For example,
+ if there is only 512mb memory available, a 176mb
+ directory may seriously cramp the system's style.)
+
i_version Enable 64-bit inode version support. This option is
off by default.