diff --git a/src/modules/fstab/fstab.conf b/src/modules/fstab/fstab.conf
index 74b1feb39..385161d2d 100644
--- a/src/modules/fstab/fstab.conf
+++ b/src/modules/fstab/fstab.conf
@@ -12,11 +12,9 @@
 # is listed here, use those options, otherwise use the *default*
 # options from this mapping.
 #
-# With kernels 5.15 and newer be cautious of adding the option
-# space_cache to the btrfs mount options.  If the root volume is initially
-# mounted with one version of space_cache and the mount option specifies
-# a different version or implies v1 when v2 is in use, it may fail to
-# remount properly.
+# With kernels 5.15 and newer be cautious of adding the option space_cache
+# to the btrfs mount options.  The default in 5.15 changed to space_cache=v2.
+# If space_cache or space_cache=v1 are specified, it may fail to remount.
 mountOptions:
     default: defaults,noatime
     btrfs: defaults,noatime,autodefrag,compress=zstd