doc: reference POS syntax in --help for sort --key

* src/sort.c (usage): Reference the additional description
of the POS syntax.

diff --git a/src/sort.c b/src/sort.c
index 5179070..ff8a97a 100644 (file)
--- a/src/sort.c
+++ b/src/sort.c
@@ -386,7 +386,7 @@ Other options:\n\
 "), stdout);
       fputs (_("\
   -k, --key=POS1[,POS2]     start a key at POS1 (origin 1), end it at POS2\n\
-                            (default end of line)\n\
+                            (default end of line).  See POS syntax below\n\
   -m, --merge               merge already sorted files; do not sort\n\
 "), stdout);
       fputs (_("\