Referenced git-secrets in earlier section

CONTRIBUTING.md

@@ -19,10 +19,12 @@ We welcome outside contributions. If you'd like to make a contribution, please:
    [our Slack](https://join.slack.com/t/determined-community/shared_invite/zt-cnj7802v-KcVbaUrIzQOwmkmY7gP0Ew)
    or [community mailing list](https://groups.google.com/a/determined.ai/forum/#!forum/community).
    We'd hate for you to duplicate effort is already in-flight.
-
+   
 1. Apply the linter with `make fmt` and test locally with `make test` before
-   submitting your code.
-
+   submitting your code. Make sure that your code doesn't accidentally include
+   cloud credentials. We recommend [using git-secrets to automatically prevent 
+   this](#secrets).
+
 1. The first time you submit code, you'll need to
    [sign a CLA](https://determined.ai/cla/).