HOW to document business logic in code?

background:

I'm a frontend dev for admin system of our company. Often times I code things like: if user choose this product type and that settings then I show some other input field to input. I deal with mostly forms and show/hide UI for user. And after some time nor did user/PM/test or myself remember the logic of what should show or why something do not show.

So I want something to be able to let me write code and business logic along the way.(I'm not asking for API docs or function docs like JSDoc)

Great Thanks

Related topics:

And In terms of this, I would also like to build something to centralize PM's business DOC with developers API/dev Doc and also things like how to test for our test team and etc... basically a unified place to document everything, I think scenarios like these inside companies should exists so I would like to know how other company do this.

Don't let your team working be like this:

Monday:
Frontend: Hey, is the API ready?
Backend: Sure, will give you later

Tuesday:
Frontend: @backend, is the API ready?
Backend: yeah, yeah, will give you later, yesturday is busy.

Wednesday:
Frontend: @backend, is it ready?
Backend: Been working on some prd bugs, will give you later

Thursday:
Frontend: @backend...
Backend: ...

Friday:
Frontend: @backend...
Backend: Oh, I just find out that you should ask @backend_b for this API...

(I was actually trying to get my avatar, but this story is real)

> What's so great about Ag?

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- The command name is 33% shorter than ack, and all keys are on the home row!