Try something like "reviewed industry publications for new paradigms and optimization techniques."
My time at home is mine. If I'm reading a technology book, it's usually something I'm curious about and don't have a direct use for in my professional life.
Can't say I've ever had a problem with that in my two decades in the industry. Learning is expected and mandatory.
If you are a JavaScript programmer and spend the work day reading about Elixir; that is a problem. It likely doesn't apply to work so that should be on your own time.
Yes, you'd think that would be blindingly, painfully obvious to anybody with the cognitive ability to tie their own shoe laces. And it probably is, to everybody except the MBA "efficiency experts" that are taking over my profession.
At my first job (from high school) my first instruction was "go to company library get the book on fortran and learn it".
I don't spend significant amounts of time doing nothing but research however. The problem might not be "read three chapters of a book" on a status report, it might be having only that on a status report.
What? You've lived a truly blessed life, Dan Luu. I've observed the opposite, pretty consistently. I've been working as a programmer for 25 years and I've found, across nine separate employers (and lost-track-of-how-many different supervisors) that spending any appreciable time reading (even a book about Angular when you're supposed to be learning Angular) will become a management issue. Everywhere I've ever worked has expected learning to be on your own time. Don't believe me? Put "read three chapters of a book" on a status report and see how many levels of management show up at your desk to micromanage your time.