diff --git a/Collection-Storage.md b/Collection-Storage.md
index b92e404..c7b650f 100644
--- a/Collection-Storage.md
+++ b/Collection-Storage.md
@@ -25,9 +25,10 @@
         │   └─[f] contactX.vcf
         │
         ├─[d] /USER2
-        ...
+        ¦
 ```
 
+
 ## Collection
 
 Collection on storage is always a directory containing
@@ -74,16 +75,51 @@ jq .  .Radicale.props
 
 ### Directory: .Radicale.cache
 
-#### Directory: .Radicale.cache/history
-
-(TODO)
+```
+[d] /var
+└─[d] /lib
+  └─[d] /radicale
+    └─[d] /collections
+      └─[d] /collection-root
+        ├─[d] /USER1
+        ¦ ├─[d] /mycalendar1 (Collection)
+          ¦ ├─[d] /.Radicale.cache (automatic generated)
+            ¦ ├─[d] /item (automatic generated)
+              ├─[d] /history (automatic generated)
+              └─[d] /sync-token (automatic generated)
+```
 
 #### Directory: .Radicale.cache/item
 
-(TODO)
+1:1 reflecting items in a pre-compiled format
+
+Since 3.2.2 the item cache can be located outside by option `[storage] use_cache_subfolder_for_item = True`
+
+```
+[d] /var
+└─[d] /lib
+  └─[d] /radicale
+    └─[d] /collections
+      ├─[d] /collection-cache
+      | ├─[d] /USER1 (1:1 related to below)
+      | ¦ ├─[d] /mycalendar1 (1:1 related to below)
+      |   ¦ ├─[d] /.Radicale.cache (automatic generated)
+      |     ¦ └─[d] /item (automatic generated)
+      |
+      └─[d] /collection-root
+        ├─[d] /USER1
+        ¦ ├─[d] /mycalendar1 (Collection)
+          ¦ ├─[d] /.Radicale.cache (automatic generated)
+            ¦ ├─[d] /history (automatic generated)
+              └─[d] /sync-token (automatic generated)
+```
+
+
+
+#### Directory: .Radicale.cache/history
+
+historic pre-compiled items
 
 #### Directory: .Radicale.cache/sync-token
 
-(TODO)
-
-
+file containing synchronization tokens related to each client serve only changes on request
\ No newline at end of file