Update README.md

README.md

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 ### Dataset Summary
 
-The data set contains 327 German native speakers' speech data. The recording contents include economics, entertainment, news, oral, figure, letter, etc. Each sentence contains 10.3 words on average. Each sentence is repeated 1.4 times on average. All texts are manually transcribed to ensure the high accuracy.  
+This dataset is just a sample of 327 German native speakers' speech dataset(paid dataset). The recording contents include economics, entertainment, news, oral, figure, letter, etc. Each sentence contains 10.3 words on average. Each sentence is repeated 1.4 times on average. All texts are manually transcribed to ensure the high accuracy.  
                                                                                                                                 
-For more details, please refer to the link: https://www.nexdata.ai/datasets/speechrecog/65?source=Huggingface
+For more details & to download the rest of the dataset(paid),please refer to the link: https://www.nexdata.ai/datasets/speechrecog/65?source=Huggingface
 
 ### Supported Tasks and Leaderboards