Add link to Watlas-index and clarify where to place fragments_data.json

README.md

@@ -4,7 +4,7 @@ Online Atlas of DNA Hydration
 
 ### Usage
 
-WatNA is a dependent project of Watlas-index. It shall be deployed accordingly to the instructions provided by Watlas-index documentation.
+WatNA is a dependent project of [Watlas-index](https://gitlab.cesnet.cz/madcatxster/watlas-index). It shall be deployed accordingly to the instructions provided by Watlas-index documentation.
 
 ### Dependencies
 
@@ -76,7 +76,7 @@ Density map files (CCP4)
 
 #### `fragments_data.json`
 
-This file must be provided in order for WatNA to display the number of samples that were used to generate the hydration data for dinucleotide fragments. Since this is considered to be part of the data, the file is not directly provided in the source code. The contents of `fragments_data.json` is laid out below:
+This file must be provided in order for WatNA to display the number of samples that were used to generate the hydration data for dinucleotide fragments. Since this is considered to be part of the data, the file is not directly provided in the source code. The file must be present in WatNA's root directory. The contents of `fragments_data.json` is laid out below:
 
     {
         "threshold_hard": 500,