Update README.md

Author: crptmppt

README.md

@@ -19,7 +19,7 @@ New submissions to this registry will take the form of a GitHub Pull Request wit
 
 #### Updating existing entries
 
-Modification of entries in this registry will take the form of a GitHub Pull Request with the modification of one or more JSON files in the [mappings/](mappings) folder. Submissions will be subject to automated checking for well-formedness and human vetting before being merged to the registry.
+Modification of entries in this registry require a GitHub Pull Request with the modification of one JSON file in the [mappings/](mappings) folder.  Submissions will be subject to automated checking for well-formedness and human vetting before being merged to the registry. 
 
 
 ## Semantic content of registry entries
@@ -45,7 +45,7 @@ For a comprehensive description of all fields and how to generate them, please s
 
 1. Submissions to the registry must consist of a single commit, directly off the **master** branch of the **cardano-token-registry** repository.
 
-2. Submissions must add or modify files in the [mappings/](mappings) folder.
+2. Submissions must add or modify a singular file in the [mappings/](mappings) folder. Multiple mappings should be split accross multiple PRs.
 
 3. The file name must match the encoded `"subject"` key of the entry, all lowercase.