Clarify what the gear button does

wiki/src/blueprint/additional_software_packages/gui.mdwn

@@ -124,6 +124,9 @@ The list of additional software can be open from:
 
 Why both? See [[!tails_ticket 5521]].
 
+But also when click on the gear button next to the **Additional
+Software** feature in the persistent storage settings.
+
 ### If there is no persistent storage
 
 <img src="https://raw.githubusercontent.com/sajolida/tails-wireframes/master/additional software/png/additional software - without persistent storage.png"/>