Garry, are you not using the CONTROL + SPACE command to find out the available commands. You are right that ": add" it wasn't listed in the reference guide (it is now), but common commands are easy to discover using the CONTROL + SPACE technique (or ALT + SPACE on Chromebooks).
In the animation shown below, add is very visible. I wonder if you are using the CONTROL + SPACE / ALT + SPACE method?
