X-Git-Url: https://git.distorted.org.uk/~mdw/exim-config/blobdiff_plain/dc957579e1011086c1cd7d82d1cfe20894bfd0c0..3a58bd3cb2cc0ea1054547819356aceba4d8ab11:/defs.m4

diff --git a/defs.m4 b/defs.m4
index 8be119d..8beb3b1 100644
--- a/defs.m4
+++ b/defs.m4
@@ -169,16 +169,17 @@ m4_define(<:LOOKUP_DOMAIN:>,
 		       _LOOKUP_ARGS(<:$2:>, <:$3:>)}} \
 	     $3:>)
 
-## KV(key, result)
+## KV(key, [result])
 ##
 ## Extract the value of the named KEY in the ${extract ...}-style string in
 ## the current $value (where it may have been left by `LOOKUP-DOMAIN').  The
 ## RESULT is a pair {IF-FOUND}{IF-NOT-FOUND}; the former may use $value to
 ## refer to the value; the latter may be `fail' (not in braces) to force
-## expansion failure.
+## expansion failure.  The default is to expand to the extracted value or
+## nothing.
 m4_define(<:KV:>, <:${extract {$1}{$value}$2}:>)
 
-## DOMKV(key, result)
+## DOMKV(key, [result])
 ##
 ## Extract the value of the named KEY in the ${extract ...}-style string in
 ## $domain_data; see `KV'.