update documentation with info about RPC server

README.md

@@ -24,6 +24,12 @@ cargo build --release
 ./target/release/herodb --dir /path/to/db --port 6379
 ```
 
+## RPC Server
+
+HeroDB includes an optional JSON-RPC 2.0 management server for database administration tasks. Enable it with the `--enable-rpc` flag and specify the port with `--rpc-port` (default: 8080).
+
+For a complete list of available RPC commands and usage examples, see [RPC_COMMANDS.md](RPC_COMMANDS.md).
+
 ### Options
 
 - `--dir`: Database directory (required)
@@ -31,6 +37,8 @@ cargo build --release
 - `--debug`: Enable debug logging
 - `--encrypt`: Enable database encryption
 - `--encryption-key`: Master encryption key for encrypted databases
+- `--enable-rpc`: Enable RPC management server
+- `--rpc-port`: RPC server port (default: 8080)
 
 ### Examples