index: mention Btrfs in --no-check-device docs

Thanks to Karl-Philipp Richter for the suggestion.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/Documentation/bup-index.md b/Documentation/bup-index.md
index d85d17969b2d82bef736199aeac9fd60e33ffe64..47992d1c7dbb7c37d62a8558b840542d37d5cc4d 100644 (file)
--- a/Documentation/bup-index.md
+++ b/Documentation/bup-index.md
@@ -183,9 +183,10 @@ does, due to the accommodations described above.
     (may be repeated).  Ignore completely empty lines.
 
 \--no-check-device
-:   don't mark a an entry invalid if the device number (stat(2)
-    st_dev) changes.  This can be useful when indexing remote,
-    automounted, or (LVM) snapshot filesystems.
+:   don't mark an entry invalid if the device number (stat(2) st_dev)
+    changes.  This can be useful when indexing remote, automounted, or
+    snapshot filesystems (LVM, Btrfs, etc.), where the device number
+    isn't fixed.
 
 -v, \--verbose
 :   increase log output during update (can be used more