Update README.md

Author: tikikun

README.md

@@ -60,7 +60,7 @@ Download a llama model to try running the llama C++ integration. You can find a
 
 Double-click on Nitro to run it. After downloading your model, make sure it's saved to a specific path. Then, make an API call to load your model into Nitro.
 
-***OPTIONAL: You can run Nitro on a different port like 5000 instead of 3928 by running it manually in terminal
+***OPTIONAL***: You can run Nitro on a different port like 5000 instead of 3928 by running it manually in terminal
 ```zsh
 ./nitro 1 127.0.0.1 5000 ([thread_num] [host] [port])
 ```