From 380de91773e3c7bdf1cac4bf9ae77b05ee77b671 Mon Sep 17 00:00:00 2001
From: Geng Cheng <xmcgcg@qq.com>
Date: Tue, 11 Mar 2025 10:36:33 +0800
Subject: [PATCH] Update iostreams.tex

---
 source/iostreams.tex | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/iostreams.tex b/source/iostreams.tex
index 18a19fc2ed..24fcd1981a 100644
--- a/source/iostreams.tex
+++ b/source/iostreams.tex
@@ -7933,6 +7933,7 @@
 writes the character representation of
 formatting arguments provided by \tcode{args}
 formatted according to specifications given in \tcode{fmt} to \tcode{stream}.
+Then establishes an observable checkpoint\iref{intro.abstract}.
 
 \pnum
 \throws