Flag to have a recipe show up as a circuit signal

[IsaacOscar]

I noticed some recipes (e.g. "Casting Iron") do have signals for them.
But I can't work out what logic the game uses for those.
In particular, I can't work out a way to make a recipe show up when it doesn't already (e.g. the recycling recipes https://mods.factorio.com/mod/recycling-factoriopedia)

I suggest adding a flag, say "make_signal = true", that if set on the prototype will cause a corresponding signal to be made.

[s6x]

Did you try explicitly setting hide_from_signal_gui to false?

[IsaacOscar]

Did you try explicitly setting hide_from_signal_gui to false?

Thanks so much!
Somehow I missed that when I looked at the molten-iron prototype.
For some reason I also needed to set hidden = false though.

Hopefully a mod can come and close this pointless thread as "Already Implemented"