diff --git a/README.md b/README.md
index 90430929a..030e2dbf2 100644
--- a/README.md
+++ b/README.md
@@ -89,4 +89,7 @@ $ bin/packer
 
 You can run tests by typing `make test`.
 
+Before submitting a pull-request, please run `make format` to automatically fix
+any coding style issues.
+
 This will run tests for Packer core along with all the core builders and commands and such that come with Packer.