diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 93ed39ed1f..e5fae60c0a 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -127,13 +127,14 @@ Before submitting a request, please search for similar ones in the
 
 ## Pull Requests
 
-1. Ensure any install or build dependencies are removed before the end of the layer when doing a
+1. **Don't open the PR until it's ready for review. We need to optimize build time.**
+2. Ensure any install or build dependencies are removed before the end of the layer when doing a
    build.
-2. Update the README.md with details of changes to the interface, this includes new environment
+3. Update the README.md with details of changes to the interface, this includes new environment
    variables, exposed ports, useful file locations and container parameters.
-3. Increase the version numbers in any examples files and the README.md to the new version that this
+4. Increase the version numbers in any examples files and the README.md to the new version that this
    Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
-4. You may merge the Pull Request in once you have the sign-off of two other developers, or if you
+5. You may merge the Pull Request in once you have the sign-off of two other developers, or if you
    do not have permission to do that, you may request the second reviewer to merge it for you.
 
 ## Contributor License Agreement