added clarification

Author: mishushakov

docs/volumes.mdx

@@ -5,7 +5,7 @@ sidebarTitle: Overview
 
 Volumes provide persistent storage that exists independently of sandbox lifecycles. Data written to a volume persists even after a sandbox is shut down, and volumes can be mounted to multiple sandboxes over time.
 
-### One volume shared across multiple sandboxes
+**One volume shared across multiple sandboxes**
 
 ```mermaid
 graph LR
@@ -14,14 +14,16 @@ graph LR
   V1 --- S3[Sandbox 3]
 ```
 
-### Each sandbox with its own volume
+**Each sandbox with its own volume**
 
 ```mermaid
 graph LR
   V2[Volume A] --- S4[Sandbox 1]
   V3[Volume B] --- S5[Sandbox 2]
 ```
 
+When a volume is mounted to a sandbox, files can be read and written directly at the mount path. The SDK methods are meant to be used when the volume is not mounted to any sandbox.
+
 With E2B SDK you can:
 - [Read and write files to a volume.](/docs/volumes/read-write)
 - [Get file and directory metadata.](/docs/volumes/info)