diff --git a/OpenZFS-exceptions.md b/OpenZFS-exceptions.md
index f1cd085..d4f27c2 100644
--- a/OpenZFS-exceptions.md
+++ b/OpenZFS-exceptions.md
@@ -21,6 +21,7 @@ OpenZFS issue id | status/ZFS commit | comment
 7602|!      |OpenZFS converted all of their man pages to mdoc format which is understood by the Linux utilties.  In order to avoid massive porting headaches the latest version of the OpenZFS man pages should be added to ZoL and the Linux specific documentation notes added.
 7591|541a090|
 7586|c443487|
+7570|-      |Due to differences in the block layer all discards are handled asynchronously under Linux.  This functionality could be ported but it's unclear to what purpose.
 7542|-      |The Linux libshare code differs significantly from the upstream OpenZFS code.  Since this change doesn't address a Linux specific issue it doesn't need to be ported.  The eventual plan is to retire all of the existing libshare code and use the ZED to more flexibly control filesystem sharing.
 7430|68cbd56|
 7402|690fe64|