diff --git a/HowtoBTRFS.md b/HowtoBTRFS.md
index a428a326..5c0065b3 100644
--- a/HowtoBTRFS.md
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 ---
 title: Howto Btrfs
-categories: filesystem systeme
+categories: filesystem system
 ...
 
 * Documentation : <https://btrfs.wiki.kernel.org/index.php/Main_Page#Documentation>