readme: add some minor speculation about RoPE

README.md

@@ -17,7 +17,7 @@ This repository hosts an NeoBERT model that was fine-tuned on the CoNLL-2003 NER
 Please notice the following caveats:
 
 * ⚠️ Work in progress, as e.g. new hyper-parameter changes or bug fixes for the implemented `NeoBERTForTokenClassification` class can occur.
-* ⚠️ At the moment, don't expect BERT-like performance, more experiments are needed
+* ⚠️ At the moment, don't expect BERT-like performance, more experiments are needed. (Is RoPE causing this?)
 
 ## 📝 Implementation