diff --git a/sbin/newfs/newfs.8 b/sbin/newfs/newfs.8
index 01270b5f1b50..eaa3e40fc735 100644
--- a/sbin/newfs/newfs.8
+++ b/sbin/newfs/newfs.8
@@ -79,11 +79,9 @@ The following options define the general layout policies:
 .It Fl E
 Erase the content of the disk before making the filesystem.
 The reserved area in front of the superblock (for bootcode) will not be erased.
-.Pp
-This option is only relevant for flash based storage devices that use
-wear-leveling algorithms.
-.Pp
-Erasing may take a long time as it writes to every sector on the disk.
+Erasing is only relevant to flash-memory or thinly provisioned devices.
+Erasing may take a long time.
+If the device does not support BIO_DELETE, the command will fail.
 .It Fl J
 Enable journaling on the new file system via gjournal.
 See
@@ -264,9 +262,11 @@ Turn on the TRIM enable flag.
 If enabled, and if the underlying device supports the BIO_DELETE
 command, the file system will send a delete request to the underlying
 device for each freed block.
-The trim enable flag is typically set when the underlying device
-uses flash-memory as the device can use the delete command to
-pre-zero or at least avoid copying blocks that have been deleted.
+The trim enable flag is typically set for flash-memory devices to
+reduce write amplification which reduces wear on write-limited
+flash-memory and often improves long-term performance.
+Thinly provisioned storage also benefits by returning unused blocks to
+the global pool.
 .El
 .Pp
 The following options override the standard sizes for the disk geometry.