1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 4917cf24a5e0..10ec4639f152 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -581,6 +581,13 @@ Table of Ext4 specific ioctls
                               behaviour may change in the future as it is
                               not necessary and has been done this way only
                               for sake of simplicity.
+
+ EXT4_IOC_RESIZE_FS           Resize the filesystem to a new size.  The number
+                              of blocks of resized filesystem is passed in via
+                              64 bit integer argument.  The kernel allocates
+                              bitmaps and inode table, the userspace tool thus
+                              just passes the new number of blocks.
+
 ..............................................................................
 
 References