find: document ! (not) operator

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/findutils/find.c b/findutils/find.c
index 0ec88fd619c5fbaa11497268fe9f602a3fe3e9e4..d49adc26de4b5a778cd7c46ddace0a38b0fb64bc 100644 (file)
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -1067,6 +1067,9 @@ static action*** parse_params(char **argv)
 //usage:       IF_FEATURE_FIND_PAREN(
 //usage:     "\n       ( ACTIONS )     Group actions for -o / -a"
 //usage:       )
+//usage:       IF_FEATURE_FIND_NOT(
+//usage:     "\n       ! ACT           Invert ACT's success/failure"
+//usage:       )
 //usage:     "\n       ACT1 [-a] ACT2  If ACT1 fails, stop, else do ACT2"
 //usage:     "\n       ACT1 -o ACT2    If ACT1 succeeds, stop, else do ACT2"
 //usage:     "\n                       Note: -a has higher priority than -o"