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-rw-r--r--man/btrfs.8.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 90a0a43b..054fce0d 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -194,6 +194,9 @@ defragment operations.
\fB-t size\fP defragment only files at least \fIsize\fR bytes big
+For \fBstart\fP, \fBlen\fP, \fBsize\fP it is possible to append a suffix
+like \fBk\fP for 1 KBytes, \fBm\fP for 1 MBytes...
+
NOTE: defragmenting with kernels up to 2.6.37 will unlink COW-ed copies of data,
don't use it if you use snapshots, have de-duplicated your data or made
copies with \fBcp --reflink\fP.