Updated README.md

Author: tekord

README.md

@@ -17,13 +17,16 @@ pip install pyyaml
 
 ## Usage
 
-Copy `opcodes.example.yaml` file to your application's folder, define all opcodes you need in this file. Then run the script with specified input and output files like this:
+Copy `opcodes.example.yaml` file to your application's folder, define all opcodes you need in this file. 
+Then run the script with specified input and output files like this:
 
-```
-/path/to/script/main.py path/to/opcodes.yaml opcodes.hpp
+```shell
+python /path/to/script/main.py path/to/opcodes.yaml /path/to/template opcodes.hpp
 ```
 
-The first argument is a path to file with opcodes. The second argument is a C++ header file name which will be generated by the script. The result constant list may look like this:
+The first argument is a path to file with opcodes. The second argument is a path to template file (look at 
+the `templates` directory). The third argument is a C++ header file name which will be generated by the script. 
+The result constant list may look like this:
 
 ```cpp
 enum _GeneratedOpCodes {