update code comment style
@@ -107,6 +107,16 @@ A comment is generally used for:
- Opens the `log` file
+### Taboos in comments
+
+The Code Comment Style defined in this document follows the [CNCF Code of Conduct](https://github.com/tikv/tikv/blob/master/CODE_COMMENT_STYLE.md). The following language uses are deemed as taboos and are not acceptable in code comments:
+
+- Sexualized language
+- Racial or political allusions
+- Public or private harassment
+- Language that contains private information, such as a physical or electronic address, without explicit permission
+- Other inapproiate uses
+
### Tips for a good comment
- Comment code while writing it.
