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README.md

@@ -174,7 +174,17 @@ The core dataset was introduced in:
 > *Proceedings of NAACL-HLT 2018*, pages 207–217
 > [https://aclanthology.org/N18-1019/](https://aclanthology.org/N18-1019/)
 
-The words are drawn from news articles and annotated by 20 people (both native and non-native English speakers) who indicated which words could be difficult for non-native speakers, children, or people with reading disabilities.
+The words are drawn from news articles and annotated by both native and non-native English speakers who indicated which words could be difficult for non-native speakers, children, or people with reading disabilities.
+
+### Annotation scheme and binarization
+
+Each word was independently labeled by approximately 10 annotators. The `annotators` column records how many annotators marked the word as complex. Binary labels were derived using a threshold:
+
+- **Simple (0)**: No annotator marked the word as complex (`annotators = 0`)
+- **Complex (1)**: Three or more annotators marked it as complex (`annotators >= 3`)
+- **Excluded**: Words in the ambiguous zone (1–2 annotators) were removed from the dataset
+
+This means the dataset contains only clear cases — words that are unambiguously simple or where a meaningful fraction of annotators agreed on complexity.
 
 ### Domain generalization sources