Update README.md

Author: jfullstackdev

README.md

@@ -6,7 +6,8 @@ In this Spring Boot project, I used JPA for persistence, MySQL being the
 database.
 
 Take note, when Spring Boot (Hibernate actually) maps the java 
-class into the database, the naming convention is critical, for example:
+class (domain entity class (POJO)) into the database, the naming convention
+is critical, for example:
 
 `roboticsGrade` will be mapped in the database column as
 `robotics_grade`.