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diff --git a/features/index.mdwn b/features/index.mdwn
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@@ -39,3 +39,7 @@ The DragonFly Mail Agent is a bare-bones (though not so bare-bones any more) mai
 Originally a NetBSD port the guts have been radically adjusted and carefully tuned to provide a low-contention read path and to directly tie the backing store to the VM/paging system in a way that treats it almost like normal memory.  Only memory pressure will force tmpfs data pages into swap.
 
 TMPFS replaces MFS and MD (for post-boot use).
+
+## SWAPCACHE - Managed SSD support
+
+This DragonFly feature allows SSD-configured swap to also be used to cache clean filesystem data and meta-data.  The feature is carefully managed to maximize the write endurance of the SSD.  Swapcache is typically used to reduce or remove seek overheads related to managing filesystems with a large number of discrete inodes.  DragonFly's swap subsystem also supports much larger than normal swap partitions.  32-bit systems support 32G of swap by default while 64-bit systems support up to 512G of swap by default.