diff --git a/CONTRIBUTING.MD b/CONTRIBUTING.MD
index 214d1213..2399d53e 100644
--- a/CONTRIBUTING.MD
+++ b/CONTRIBUTING.MD
@@ -6,4 +6,5 @@
 - The pull request must be named `Add <language_name> Hello World`
 - Remember to reference issue #1
 - Only one new Hello World per pull request
+- Don't add existing Hello World programs in the repo. You can see them in #1
 ## I will merge your pull request on condition that it's valid.