Update README.md

README.md

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+## Disclaimer on data completeness
+
+Not all genomic entries in this dataset contain every type of annotation (exons, introns, and proteins).
+
+While the GenBank records were filtered to include sequences annotated with "exon", "intron", and "CDS" feature keys, the underlying annotations in GenBank are not always deterministic or complete.
+
+Some sequences may include only exons or introns without corresponding protein-coding regions, or vice versa.
+
+This reflects the inherent variability and curation differences across submissions in the GenBank database.
+
+---
+
+
 ### Citation
 
 If you use this dataset in your research, please cite: