subdirmk: Fix a Subdir left over in README

[secnet.git] / README

diff --git a/README b/README
index d9b8cc24c0eaa32a421bfbe2f705f5646f253a4f..2f1a1ce4ae4f1ba66813fac327f36db73a9a6112 100644 (file)
--- a/README
+++ b/README
@@ -205,6 +205,10 @@ Dollar doubling and macro assistance
 &$-            Stops dollar-doubling
        Both are idempotent and local to the file or context.
 
+This is useful both for make macrology involving $(eval ...), and
+possibly for helping write complicated recipes involving shell
+variables, inline Perl code, etc.
+
 Sometimes we will show $'s being doubled inside another construct.
 This means the content of the construct is $-doubled: $-doubling is
 locally enabled, and restored afterwards.
@@ -233,8 +237,8 @@ $   =>      $$      including $'s produced by other
                         &-expansions not mentioned here
 
 &\$    =>      $
-&$NN   =>      $(NN)   where N are digits
-&$(    =>      $(
+&$(    =>      ${      (expands to { } so it is useable for shell too)
+&$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
@@ -407,7 +411,7 @@ far enough to regenerate a working set of makefiles.  If this happens
 just rerun ./config.status by hand.
 
 If you go back and forth between different versions of your code you
-can sometimes find that `make' complains that one of your Subdir.sd.mk
+can sometimes find that `make' complains that one of your Dir.sd.mk
 files is missing: typically, if iot was used and therefore a
 dependency in some other version of your code.  If you run `make
 clean' (or `make realclean') these dependencies are suppressed, which