explanation 3.2.1

3-Add-simulated-motors.md

@@ -56,6 +56,12 @@ index 34998d9..273bea4 100644
 ```
 </details>
 
+<details><summary>what does this mean?</summary>
+
+The `motorSim.iocsh` script will be loaded when the `motors.iocsh` script is run, and the motor instance defined in the `motorSim.iocsh` script will be set up with the specified parameters (instance name, home position, number of axes, high and low limits, and substitution definitions). Thisis useful for running a simulation of your motor system for testing or development purposes.
+
+</details>
+
 #### 3.2.2 Edit substitutions/motorSim.substitutions
 
 ```