If you've ever finished a chapter, lecture, or meeting with a page full of yellow and still couldn't tell someone what it was actually about — you don't have a memory problem. You have a filtering problem.

Here are 3 signs your highlighting is working against you, and the fast fix for each.

1. You highlight while you're still reading the sentence

By the time you finish the sentence, you don't actually know if it was important — you highlighted on reflex. Fix: finish the paragraph first, then go back and mark only the one sentence that the rest of the paragraph was built to support. If you can't find one sentence like that, the paragraph probably wasn't a key point.

2. More than ~20% of the page is highlighted

If everything is marked, nothing is marked — your future self has to re-read the whole page anyway. Fix: cap yourself. One key point per paragraph, max. If you're tempted to highlight more, you're highlighting supporting detail, not the point itself.

3. You can't turn your highlight into a 5-10 word note without looking back at the page

This is the real test. A true key point can be compressed. If you stare at your own highlight and can't summarize it in one short phrase, you either highlighted the wrong sentence or you highlighted an example instead of the underlying idea. Fix: for every highlight, immediately write a 5-10 word note in the margin. If you can't, undo the highlight and find the sentence that actually made the claim.

The pattern underneath all three: highlighting isn't a reading behavior, it's a compression behavior. You're not marking "stuff that sounds important" — you're identifying the one claim per section that the rest of the material exists to support, and restating it in your own words.

That compression skill (Scan → Isolate → Compress) is the whole system I teach inside KeyPoint Academy if you want the full step-by-step version with practice material for textbooks, articles, lectures, and meetings.