diff --git a/LICENSE b/LICENSE
index cd3bfcb4b1..31742054bf 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,23 @@
+NOTICE TO PROSPECTIVE UPSTREAM CONTRIBUTORS
+
+This software is licensed under the MIT License below. However, the
+author politely but firmly requests that you do not submit this work, or
+any derivative thereof, to the Zig project upstream unless at least one
+of the following conditions is met:
+
+  (1) You have obtained explicit written permission from a Zig core team
+      member authorizing the submission; or
+
+  (2) You have manually re-typed every byte of the material you intend
+      to submit. If submitting under this option, you must clearly
+      state: (a) where the code was acquired from, and (b) whether any
+      modifications were made during or after transcription.
+
+This notice is not a license restriction. The MIT License governs all
+use of this software. This is a social contract: please honor it.
+
+---
+
 The MIT License (Expat)
 
 Copyright (c) Motiejus Jakštys