diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a1c17ecd94..f82ca1e5ba 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -197,8 +197,13 @@ yourself will help your PRs be merged faster, and folks will appreciate the
 quality and professionalism of your work.
 
 Then, submit your changes. Carefully reading our [Git guide][git-guide], and in
-particular the section on [making a pull request][git-guide-make-pr],
-will help avoid many common mistakes.
+particular the section on [making a pull request][git-guide-make-pr], will help
+avoid many common mistakes. If any part of your contribution is from someone
+else (code snippets, images, sounds, or any other copyrightable work, modified
+or unmodified), be sure to review the instructions on how to [properly
+attribute][licensing] the work.
+
+[licensing]: https://zulip.readthedocs.io/en/latest/contributing/licensing.html#contributing-someone-else-s-work
 
 Once you are satisfied with the quality of your PR, follow the
 [guidelines on asking for a code