[keycloak-user] Question about how to extend or know more about keycloak

Hi all, i am now checking keycloak to see whether i can adopt it and extend it to fulfill my project's requirement. However, when i try to check the source code in github, i found there is almost no comment on the source code of keycloak!!! The javadocs are empty: https://www.keycloak.org/docs-api/6.0/javadocs/index.html i am quite surprise that how you guys can develop and maintenance keycloak! Without the code comment or javadocs, it will difficult for me to study and extend keycloak (not even enough for creating SPI) Thanks.