examples: Add description of '-r' flag

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/examples/hello.c b/examples/hello.c
index dfa7767..fd44bdd 100644
--- a/examples/hello.c
+++ b/examples/hello.c
@@ -45,7 +45,8 @@ help(char **argv)
     printf(
         "usage: %s -i <iface>\n"
         "[-h]   Show this message\n"
-        "[-i]   Interface to use\n",
+        "[-i]   Interface to use\n"
+        "[-r]   Wait for RX\n",
         argv[0]
     );
 }