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-rw-r--r--Documentation/btrfs-show-super.asciidoc4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/btrfs-show-super.asciidoc b/Documentation/btrfs-show-super.asciidoc
index 1646be3b..8866c940 100644
--- a/Documentation/btrfs-show-super.asciidoc
+++ b/Documentation/btrfs-show-super.asciidoc
@@ -40,6 +40,10 @@ If several '-i <super_mirror>' are given, only the last one is valid.
Attempt to print the superblock even if no superblock magic is found. May end
badly.
+-s <bytenr>::
+specifiy offset to a superblock in a non-standard location at 'bytenr', useful
+for debugging (disables the '-f' option)
+
EXIT STATUS
-----------
*btrfs-show-super* will return 0 if no error happened.