README: Document restriction on $-doubling and lack of -quadrupling

[subdirmk.git] / README

diff --git a/README b/README
index 5fe395001769458961e4c4aefa11aa4bee1b7b05..ad6c13ef3d53a67268cbf5c924e7ea0d6561ebce 100644 (file)
--- a/README
+++ b/README
@@ -322,6 +322,10 @@ $  =>      $$      including $'s produced by other
 &$NN   =>      $(NN)   where N are digits
 &$(    =>      $(
 
 &$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
 ---------------------------------
 
 Tables of file reference syntaxes
 ---------------------------------