Update README.md

README.md

@@ -14,7 +14,7 @@ The dataset is designed to train and evaluate optical character recognition syst
 
 ## Data structure
 
-For each text there is a file with its image and the text corresponding to this image. The names of these files are the same except for the extension or suffix `_image` and `_text` respectively. The images are placed in either pdf or png files. The texts are contained in files with the extension txt. For example:
+For each text there is a file with its image and the text corresponding to this image. The names of these files are the same except for the extension or suffix `_image` and `_text` respectively. The images are placed in either pdf or png files. The texts are contained in files with the extension `txt`. For example:
 
 * `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.pdf`
 * `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.txt`