From 8e1399dbdac9dbf26d8fa00a5453bce6f2639740 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii
Date: Tue, 7 Apr 2026 09:59:53 +0300
Subject: ; * doc/lispref/os.texi (Timers): Mention primitives that wait
 (bug#80755).

---
 doc/lispref/os.texi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/lispref/os.texi b/doc/lispref/os.texi
index 38d7ad44c4a..72a1fdc7878 100644
--- a/doc/lispref/os.texi
+++ b/doc/lispref/os.texi
@@ -2382,6 +2382,7 @@ calling a timer function in a row, when many previously scheduled
 calls were unavoidably delayed.
 @end defopt
 
+@cindex running code with timeout
 @defmac with-timeout (seconds timeout-forms@dots{}) body@dots{}
 Execute @var{body}, but give up after @var{seconds} seconds.  If
 @var{body} finishes before the time is up, @code{with-timeout} returns
@@ -2400,6 +2401,8 @@ primitive that can wait, @code{with-timeout} cannot stop executing
 @var{body} while it is in the midst of a computation---only when it
 calls one of those primitives.  So use @code{with-timeout} only with a
 @var{body} that waits for input, not one that does a long computation.
+Primitives that wait for input include @code{sit-for}, @code{sleep-for},
+@code{accept-process-output}, and some others.
 @end defmac
 
   The function @code{y-or-n-p-with-timeout} provides a simple way to use
-- 
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