diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index c6a396d..59e33dc 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,12 +13,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "2025/xg-infra-upgrade-2025.md",
+                "file": "2021/zfs-snapshots.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "xg-infra-upgrade-2025"
+              "title": "zfs-snapshots"
             }
           }
         ]
@@ -165,8 +165,8 @@
   },
   "active": "316987f51496a482",
   "lastOpenFiles": [
-    "2021/zfs-snapshots.md",
     "2025/xg-infra-upgrade-2025.md",
+    "2021/zfs-snapshots.md",
     "2024/april-training-mental-physical-goede-voornemens.md",
     "2022/Adimec R D Software Quality Working Group.md",
     "2022/apc-forum-donate-copyleft-symbool-dat-is-gek.png",
diff --git a/2021/zfs-snapshots.md b/2021/zfs-snapshots.md
index 83bc070..669741a 100644
--- a/2021/zfs-snapshots.md
+++ b/2021/zfs-snapshots.md
@@ -22,4 +22,5 @@ zfs set snapdir=visible zroot/data/syncthing
 
 See:
 * https://github.com/j-keck/zfs-snap-diff
-* https://j-keck.github.io/zsd/
\ No newline at end of file
+* https://j-keck.github.io/zsd/
+* https://docs.oracle.com/cd/E19253-01/819-5461/gbcya/index.html
\ No newline at end of file