Description of Complexity of computed properties

One or two years ago I read in the documentation that the best practice is writing a comment about a complexity of a computed variable or a constant if it is calculated more than a constant time. Nowadays, I can't find this comment in the docs. Can somebody help to me? Was it removed or I just wrong ( misunderstood something)?

You mean this, from the API Design Guidelines?

  • Document the complexity of any computed property that is not O(1). People often assume that property access involves no significant computation, because they have stored properties as a mental model. Be sure to alert them when that assumption may be violated.
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Yes! Thanks a lot!