1 files changed, 1 insertions, 0 deletions

diff --git a/trace-usage.c b/trace-usage.c
index 88f744c..d1f3bfd 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -24,6 +24,7 @@ static struct usage_help usage_help[] = {
                 "          -p run command with plugin enabled\n"
                 "          -F filter only on the given process\n"
                 "          -P trace the given pid like -F for the command\n"
+                "          -c also trace the childen of -F or -P\n"
                 "          -l filter function name\n"
                 "          -g set graph function\n"
                 "          -n do not trace function\n"