From 11d501de275c2143a01e4b1eb7f54f798110ff6c Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Mon, 24 Mar 2025 07:07:59 +0800
Subject: README.md: Add known issue about Safari address families

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'README.md')

diff --git a/README.md b/README.md
index 736ab3c..3a6fb88 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ It may experience occasional outages.
   cause issues if a user completes the challenge at the end of a rounded week.
 - SHA-256 is actually a pretty bad choice for proof-of-work. We should use
   something like bcrypt or scrypt or argon2.
+- Safari on iOS and iPadOS seem to unpredictably make their requests from
+  different address families, which causes the challenge to fail.
 
 ## Build
 
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