Stash The Current Prompt To Send Another First

I've been working my way through the current cohort of Matt Pocock's Claude Code for Real Engineers. The best part about going through a series of videos like this is being able to pick up big and small tips and tricks from another person's workflow.

One of the small things I picked up in an early video is the ability to stash the current prompt.

Let's say I've gone to the trouble of writing out a detailed prompt, @'ing some files, and so forth. Then I realize I need first prompt Claude to do something else first. Instead of copy-pasting that prompt into my notes, deleting it, issuing a different prompt, and then pasting it back in, I can hit Ctrl-s.

Ctrl-s will stash the current prompt, clearing out the prompt input. I can then type in something else. Once I hit enter for that new prompt, it will be sent to Claude and the stashed prompt will be immediately populated back into the input.

Though Ctrl-s is mentioned when you hit ? from within claude session, I don't see it documented anywhere in their Interactive Mode reference.