From 3719d006ac3b5aa6d2beb9739a1d1e637ec3d53f Mon Sep 17 00:00:00 2001
From: Yoshiyuki Mineo <Yoshiyuki.Mineo@jp.sony.com>
Date: Sat, 13 Aug 2022 00:23:02 +0900
Subject: [PATCH] Add a note (#36)

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 8408f54..9c9ebeb 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,10 @@ func (sf *Sonyflake) NextID() (uint64, error)
 NextID can continue to generate IDs for about 174 years from StartTime.
 But after the Sonyflake time is over the limit, NextID returns an error.
 
+> **Note:**
+> Sonyflake currently does not use the most significant bit of IDs,
+> so you can convert Sonyflake IDs from `uint64` to `int64` safely.
+
 AWS VPC and Docker
 ------------------