diff --git a/doc/ADMIN.md b/doc/ADMIN.md
index 3d41115..c6f90e6 100644
--- a/doc/ADMIN.md
+++ b/doc/ADMIN.md
@@ -4,9 +4,10 @@
 
 # Informations you should be aware of:
  * This application provide a node that you can connect to a garage cluster. Few option are manageable by the config panel for the current node but IT DOESN'T offer simpler way to manage bucket and keys. You have to do it by command line or let an other node managing it.
-  * This application consider that the weight of the node is the size reserved to garage in G (Gigabytes)
+ * This application consider that the weight of the node is the size reserved to garage in G (Gigabytes)
  * This application will try to create a virtual disk to ensure garage doesn't use more than allowed. If virtualisation is not available your responsible to check space used by garage.
- * to connect from another node, you might need the RPC port. Is is defined in `rpc_bind_addr` in your `garage.toml`
+ * To connect from another node, you might need the RPC port. Is is defined in `rpc_bind_addr` in your `garage.toml`
+ * Storage consumption : appart from your data storage, you can expect the metadata (database) to consume approximatly 1% of the data size (1GB for 100GB of data for instance), or a bigger value if you store many small objects.
 
 ## How to use the S3 API from other softwares