From 6dab8842f384bf88d27d7ec4f328a476abea81e8 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 26 Dec 2019 02:03:07 +0000
Subject: [PATCH 1/1] README: Document restriction on $-doubling and lack of
 -quadrupling

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 README | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README b/README
index 5fe3950..ad6c13e 100644
--- a/README
+++ b/README
@@ -322,6 +322,10 @@ $	=>	$$	including $'s produced by other
 &$NN	=>	$(NN)	where N are digits
 &$(	=>	$(
 
+A few contexts do not support $-doubling, such as directive arguments
+or places where this might imply $-quadrupling.  (There is no way to
+get $-quadrupling.)
+
 
 Tables of file reference syntaxes
 ---------------------------------
-- 
2.30.2