Update README.md

README.md

@@ -21,6 +21,8 @@ Finetuned on Greek speech datasets and a small part of Emilia-EN dataset to prev
 
 Model can generate Greek text with Greek reference speech, English text with English reference speech, and mix of Greek and English (quality here needs improvement, and many runs might be needed to get good results).
 
+#### NOTE: For Greek text, there is an issue with uppercase characters and it will skip them, so only use lowercase characters!
+
 ## Datasets used:
 
 - Common Voice 12.0 (All Greek Splits) (https://huggingface.co/datasets/mozilla-foundation/common_voice_12_0)