Add a link to Common Voice v4.0.

README.md

@@ -23,7 +23,7 @@ Please check out [our paper](https://arxiv.org/abs/2201.03713) for the detailed
 # Load the data
 
 
-The following example loads the translation speech (i.e. target speech) and the normalized translation text (i.e. target text) released in CVSS corpus. You'll need to load the source speech and optionally the source text from Common Voice v4.0 separately.
+The following example loads the translation speech (i.e. target speech) and the normalized translation text (i.e. target text) released in CVSS corpus. You'll need to load the source speech and optionally the source text from [Common Voice v4.0](https://huggingface.co/datasets/mozilla-foundation/common_voice_4_0) separately, and join them by the file names.
 
 ```py
 from datasets import load_dataset