Index: vim-9.0.1188/runtime/syntax/fstab.vim
===================================================================
--- vim-9.0.1188.orig/runtime/syntax/fstab.vim
+++ vim-9.0.1188/runtime/syntax/fstab.vim
@@ -35,7 +35,7 @@ syn match fsOperator /[,=:#]/
 " Device
 syn cluster fsDeviceCluster contains=fsOperator,fsDeviceKeyword,fsDeviceError
 syn match fsDeviceError /\%([^a-zA-Z0-9_\/#@:\.-]\|^\w\{-}\ze\W\)/ contained
-syn keyword fsDeviceKeyword contained none proc linproc tmpfs devpts devtmpfs sysfs usbfs
+syn keyword fsDeviceKeyword contained none proc linproc tmpfs debugfs devpts devtmpfs sysfs usbfs
 syn keyword fsDeviceKeyword contained LABEL nextgroup=fsDeviceLabel
 syn keyword fsDeviceKeyword contained UUID nextgroup=fsDeviceUUID
 syn keyword fsDeviceKeyword contained PARTLABEL nextgroup=fsDevicePARTLABEL