diff --git a/aucat/aucat.c b/aucat/aucat.c
index c7e366d..83fdfec 100644
--- a/aucat/aucat.c
+++ b/aucat/aucat.c
@@ -85,13 +85,13 @@ volatile sig_atomic_t debug_level = 1;
 #endif
 volatile sig_atomic_t quit_flag = 0;
 
-char aucat_usage[] = "usage: " PROG_AUCAT " [-dlMn] [-b nframes] "
+char aucat_usage[] = "usage: " PROG_AUCAT " [-dn] [-b nframes] "
     "[-C min:max] [-c min:max] [-e enc]\n\t"
     "[-f device] [-h fmt] [-i file] [-j flag] [-m mode] [-o file]\n\t"
     "[-q port] [-r rate] [-t mode] [-v volume] [-w flag] [-x policy]\n\t"
     "[-z nframes]\n";
 
-char sndiod_usage[] = "usage: " PROG_SNDIOD " [-dlM] [-a flag] [-b nframes] "
+char sndiod_usage[] = "usage: " PROG_SNDIOD " [-dM] [-a flag] [-b nframes] "
     "[-C min:max] [-c min:max] [-e enc]\n\t"
     "[-f device] [-j flag] [-L addr] [-m mode] [-q port] [-r rate]\n\t"
     "[-s name] [-t mode] [-U unit] [-v volume] [-w flag] [-x policy]\n\t"