diff --git a/src/main.c b/src/main.c
index 36e5cdbe..cc741540 100644
--- a/src/main.c
+++ b/src/main.c
@@ -225,12 +225,14 @@ static void usage(void)
     "Usage: %s [options]\n"
     "Options:\n"
     "  -p <partno>            Specify AVR device\n"
-    "  -p <wildcard>/<flags>  Run developer options for matched AVR devices\n"
+    "  -p <wildcard>/<flags>  Run developer options for matched AVR devices,\n"
+    "                         e.g., -p ATmega328P/s or /S for part definition\n"
     "  -b <baudrate>          Override RS-232 baud rate\n"
     "  -B <bitclock>          Specify bit clock period (us)\n"
     "  -C <config-file>       Specify location of configuration file\n"
     "  -c <programmer>        Specify programmer type\n"
-    "  -c <wildcard>/<flags>  Run developer options for matched programmers\n"
+    "  -c <wildcard>/<flags>  Run developer options for matched programmers,\n"
+    "                         e.g., -c 'ur*'/s for programmer info/definition\n"
     "  -A                     Disable trailing-0xff removal for file/AVR read\n"
     "  -D                     Disable auto erase for flash memory; implies -A\n"
     "  -i <delay>             ISP Clock Delay [in microseconds]\n"