diff --git a/ZFS-RAIDs.md b/ZFS-RAIDs.md
index 6cab67bf0e21970138bcb7ed0342d6f02036d076..69896f652756d06f2cb913fd71644074302b1b79 100644
--- a/ZFS-RAIDs.md
+++ b/ZFS-RAIDs.md
@@ -1,8 +1,8 @@
 # ROADMAP
 - [x] RAID{0,1,6,10}
 - [x] ZFS description and capabilities
-- [X] RAID implementations in ZFS
-- [ ] Cache systems in ZFS
+- [x] RAID implementations in ZFS
+- [x] Cache systems in ZFS
 ___
 
 - [ ] ZFS for DB or lvm+ext4
@@ -72,3 +72,8 @@ ZFS implements versions of RAID0, RAID1 and RAID6. The first and second one are
 As known in RAID10 implementation, ZFS can take two or more RAID1 tank arrangements to make a RAID0 array, resulting in a RAID10 setup. This setup needs at least four total disks
 
 It's important to know that a RAID0 and RAID1 requires at least two disks, and any RAID-Z requires at least n+2 disks, n being the total amount of parity disks available in the system.
+
+## Cache in ZFS
+### Read caching:
+- ARC (**A**daptive **R**placement **C**ache) |=| Simple RAM cache.
+- L2ARC (**L**evel **2** **ARC**) |=| Adds SSDs in cache flow so oldest data removed from RAM gets on a faster device than hard drives.