diff --git a/README.md b/README.md
index efc0128..b5ebed6 100644
--- a/README.md
+++ b/README.md
@@ -72,34 +72,7 @@ add this crate at your cargo.toml :
 
 ```toml
 # the branch is the coppelia version
-zmq_remote_api = { git = "https://github.com/samuel-cavalcanti/rust_zmqRemoteApi", branch = "CoppeliaSim_4.4.0"}
+zmq_remote_api = { git = "https://github.com/samuel-cavalcanti/rust_zmqRemoteApi", branch = "CoppeliaSim_4.5.1"}
 ```
 
 See this simple [example](examples/get_simulation_time.rs) to understand how to use this create.
-
-### Main Branch
-
-the main branch use the smart pointers
-```rust
-// main branch
-let client = zmq_remote_api::RemoteApiClient::new(RemoteApiClientParams {
-host: "localhost".to_string(),
-..RemoteApiClientParams::default()
-})?;
-
-// Rc means Reference counter, is a smart pointer that counter the number of references
-let client = Rc::new(client);
-let sim = Sim::new(client.clone());
-```
-Using smart pointer is easier than dealing with borrowing and life cycle.
-
-```rust
-// CoppeliaSim_4.4.0, CoppeliaSim_4.3.0
-
- let client = zmq_remote_api::RemoteApiClient::new(RemoteApiClientParams {
-        host: "localhost".to_string(),
-        ..RemoteApiClientParams::default()
-    })?;
-
-    let sim = Sim::new(&client);
-```
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