X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=README;h=ad6c13ef3d53a67268cbf5c924e7ea0d6561ebce;hp=5fe395001769458961e4c4aefa11aa4bee1b7b05;hb=6dab8842f384bf88d27d7ec4f328a476abea81e8;hpb=d5f77bb5d153811dde914ab4859099f0878e7557

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
 ---------------------------------