describe how to use options in README

README.md

@@ -69,7 +69,7 @@ h, err := libp2p.New(
 ```
 
 The example above will replace the default transports with a single TCP
-transport. To add multiple tranports, use `ChainOptions`:
+transport. To add multiple transports:
 
 ``` go
 // TCP and QUIC:
@@ -79,6 +79,13 @@ h, err := libp2p.New(
 )
 ```
 
+To use TCP transport options, pass them to the `libp2p.Transport` constructor:
+```go
+h, err := libp2p.New(
+    libp2p.Transport(tcp.NewTCPTransport, tcp.DisableReuseport(), tcp.WithConnectionTimeout(20*time.Second))
+)
+```
+
 ## Addresses
 
 The TCP transport supports [multiaddrs][multiaddr] that contain a `tcp`