- Corrected command to run tank_design

docs/documentation/sizing/tank_design/run_your_first_tank_design.md

@@ -11,7 +11,7 @@ The tool can be executed from the console directly if all paths are set. The fol
 Some of the above mentioned steps did not work? Check out the [troubleshooting](#troubleshooting) section for advices.
 Also, if you need some additional information on the underlying methodology, check out the page on the [tank design method](tank_design_method.md).
 
-So, feel free to open the terminal and run `tank_design.exe` to see what happens...
+So, feel free to open the terminal and run `python.exe tank_design.py` to see what happens...
 
 ### Console output {#console-output}
 Firstly, you see output in the console window. Let's go through it step by step...