From 720411899a973be7c40d02f9db24f616d6a16afe Mon Sep 17 00:00:00 2001
From: AN Long <aisk1988@gmail.com>
Date: Mon, 7 Jul 2025 01:15:00 +0900
Subject: [PATCH] Update limitations.md to add behavior on small hash

---
 doc/limitations.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/limitations.md b/doc/limitations.md
index bbe33707e..505a9c4b1 100644
--- a/doc/limitations.md
+++ b/doc/limitations.md
@@ -213,3 +213,7 @@ Prints `:append`.
 #### mruby [3.5.0 (2025-04-28)]
 
 Nothing printed (since `include` does not call `append_features` internally).
+
+## No `#hash` call for small hashes
+
+For performance reasons, mruby avoids calling the `#hash` method on keys when a hash table is small. This means that custom `#hash` methods on key objects may not be executed.