diff --git a/README.md b/README.md
index 8883e77..d3e47e6 100644
--- a/README.md
+++ b/README.md
@@ -19,17 +19,39 @@ This script (`oracle_clone.sh`) performs a clone of an Oracle database using the
 - `-p <pfilepath>`   Custom pfile for the clone
 - `-a <key,value>`   Advanced Cloning Options (can be used multiple times)
 - `-b <pdb1,pdb2>`   Comma-separated list of PDBs to clone (include only these PDBs. `PDB$SEED` is always included)
+- `-c <channels>`    Number of RMAN channels to use (sets `numChannels` in the API payload)
 - `-d`               Dry run mode - show API payload without executing
 
+## Configuration (`rbk_api.conf`)
+
+Before running the script, you must configure Rubrik API access in the `rbk_api.conf` file (located in the same directory). This file should define the following variables:
+
+- `RUBRIK_IP`: The IP address or DNS name of your Rubrik CDM cluster.
+- `ID`: The service account ID or user credential for API authentication.
+- `SECRET`: The secret or password for the service account/user.
+- `RSC_HOST`: API endpoint host for SLA modification and other GraphQL calls
+
+**Example `rbk_api.conf`:**
+```properties
+RUBRIK_IP=<cdm IP address>
+ID="client|your-service-account-id"
+SECRET=your-service-account-secret
+RSC_HOST=customername.my.rubrik.com
+```
+
+> **Note:** Do not share your `rbk_api.conf` file or secrets publicly.
+
 ## Notes
 
 - The script requires access to the Rubrik API and expects the supporting functions `oracle_funcs.sh` to be present in the same directory.
 - Time is passed to `date` on the local machine and uses the local timezone.
+- If `-b` is specified, the script will print the list of PDBs included in the clone.
+- The `-c` option allows you to specify the number of RMAN channels to use for the clone operation. This is passed as `numChannels` in the API payload.
 
 ## Example
 
 ```bash
-./oracle_clone.sh -h dbhost01 -t "2024-06-01 12:00:00" -n CLONE01 -b PDB1,PDB2 orcl targethost
+./oracle_clone.sh -h dbhost01 -t "2024-06-01 12:00:00" -n CLONE01 -b PDB1,PDB2 -c 8 orcl targethost
 ```
 
-This will clone the `orcl` database from `dbhost01` to `targethost`, using the specified timestamp, new SID `CLONE01`, and only include `PDB$SEED`, `PDB1`, and `PDB2`.
+This will clone the `orcl` database from `dbhost01` to `targethost`, using the specified timestamp, new SID `CLONE01`, only include `PDB$SEED`, `PDB1`, and `PDB2`, and use 8 RMAN channels for the operation.