Update README.md

README.md

@@ -10,7 +10,7 @@ GenECG is divided into the following subsets:
 
 -Dataset B: ECGs with imperfections (Dataset_B_ECGs_with_imperfections) - This subset contains the same 21799 ECG images as Dataset A, but with added visual imperfections that simulate common issues found in photographed ECGs.
 
-The original PTB-XL metadata can be found in the following CSV file: https://physionet.org/content/ptb-xl/1.0.3/ptbxl_database.csv
+The original PTB-XL metadata can be found in the following CSV file: https://physionet.org/content/ptb-xl/1.0.3/ptbxl_database.csv .
 Images in the GenECG dataset have the same ecg_id as the PTB-XL dataset with the addition of _hr_1R to the ECG ID. For example, ECG 02000_hr_1R.png from GenECG corresponds to 02000_hr.dat in PTB-XL. 
 
 For more information about the creation of GenECG, please refer to the following publication: DOI: https://doi.org/bmjhci-2024-101335