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-rw-r--r--CONTRIBUTING.md10
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@@ -80,6 +80,16 @@ $ docker-compose run debug
All possible values for `RUBY_VERSION` and `OPENSSL_VERSION` can be found in
[`.travis.yml`](https://github.com/ruby/openssl/tree/master/.travis.yml).
+**NOTE**: these commands must be run from the openssl repository root, in order
+to use the
+[`docker-compose.yml`](https://github.com/ruby/openssl/blob/master/docker-compose.yml)
+file we have provided.
+
+This Docker image is built using the
+[Dockerfile](https://github.com/ruby/openssl/tree/master/tool/ruby-openssl-docker)
+provided in the repository.
+
+
## Relation with Ruby source tree
After Ruby 2.3, `ext/openssl` was converted into a "default gem", a library