Update README.md

README.md

@@ -42,7 +42,7 @@ LittleCurriculum is produced from FineWeb-Edu using five sequential filters:
 4. Advanced mathematical/symbolic notation filtering
 5. Beyond-K–5 vocabulary filtering
 
-The filters constrain the **developmental level** of a text—the knowledge, complexity, and reasoning it demands—not its subject matter. Advanced **Beyond-K–5 concepts** (e.g. calculus, quantum physics) are removed, but topic is deliberately not curated: everyday material on any subject a curious learner might explore—aviation, current events, crime in the news—can appear when written at a K–5 level. Likewise, words associated with advanced topics may occur in ordinary, grade-appropriate contexts. Full construction details, thresholds, validation, and limitations are described in the [paper](https://arxiv.org/abs/2608.13545). 
+The filters constrain the developmental level of a text, i.e. the knowledge, complexity, and reasoning it demands, not its subject matter. Advanced **Beyond-K–5 concepts** are removed, but topic is deliberately not curated: everyday material on any subject a curious learner might explore—aviation, current events, crime in the news—can appear when written at a K–5 level. Likewise, words associated with advanced topics may occur in ordinary, grade-appropriate contexts. Full construction details, thresholds, validation, and limitations are described in the [paper](https://arxiv.org/abs/2608.13545). 
 
 ## Citation
 ```bibtex