[ipaccess] Document the software argument for firmware loading
diff --git a/openbsc/src/ipaccess/ipaccess-config.c b/openbsc/src/ipaccess/ipaccess-config.c
index 3b81c2a..f9746c2 100644
--- a/openbsc/src/ipaccess/ipaccess-config.c
+++ b/openbsc/src/ipaccess/ipaccess-config.c
@@ -399,6 +399,7 @@
 	printf("  -l --listen testnr \tPerform specified test number\n");
 	printf("  -h --help this text\n");
 	printf("  -s --stream-id ID\n");
+	printf("  -d --software firmware\n");
 }
 
 int main(int argc, char **argv)