diff --git a/doc/genkernel.8.txt b/doc/genkernel.8.txt
index 165de13..2b700a8 100644
--- a/doc/genkernel.8.txt
+++ b/doc/genkernel.8.txt
@@ -274,6 +274,9 @@ INITIALIZATION
 *--*[*no-*]*e2fsprogs*::
     Includes or excludes e2fsprogs.
 
+*--*[*no-*]*btrfs*::
+    Includes or excludes btrfs RAID support.
+
 *--*[*no-*]*zfs*::
     Includes or excludes ZFS support.