diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c61c4f3..70bb83f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -146,6 +146,8 @@ project:
 If you have any other questions about contributing, please feel free to contact
 us.
 
+**Don't edit files in `dist/`.** You should edit files in `lib/`.
+
 ## Special thanks to @necolas
 
-For writing the original [issue-guidelines](https://github.com/necolas/issue-guidelines/) from which these were adapted.
\ No newline at end of file
+For writing the original [issue-guidelines](https://github.com/necolas/issue-guidelines/) from which these were adapted.