diff --git a/llvm/docs/InstCombineContributorGuide.md b/llvm/docs/InstCombineContributorGuide.md
index 2416fd0920f62..51d04dd074c56 100644
--- a/llvm/docs/InstCombineContributorGuide.md
+++ b/llvm/docs/InstCombineContributorGuide.md
@@ -554,3 +554,11 @@ guidelines.
    use of ValueTracking queries. Whether this makes sense depends on the case,
    but it's usually a good idea to only handle the constant pattern first, and
    then generalize later if it seems useful.
+
+## Guidelines for reviewers
+
+ * Do not ask contributors to implement non-splat vector support in code
+   reviews. If you think non-splat vector support for a fold is both
+   worthwhile and policy-compliant (that is, the handling would not result in
+   any appreciable increase in code complexity), implement it yourself in a
+   follow-up patch.