diff --git a/README.md b/README.md
index 0c7b6d1..af496eb 100644
--- a/README.md
+++ b/README.md
@@ -55,20 +55,20 @@ Mercury has different operating modes and parameters. Usage parameters:
 
 ```
 Usage modes: 
-./mercury -m [mode] -i [device] -o [device] -r [radio_type] -x [sound_system]
-./mercury -m ARQ -i [device] -o [device] -r [radio_type] -x [sound_system] -p [arq_tcp_base_port]
+./mercury -m [mode] -s [modulation_config] -i [device] -o [device] -r [radio_type] -x [sound_system]
+./mercury -m ARQ -s [modulation_config] -i [device] -o [device] -r [radio_type] -x [sound_system] -p [arq_tcp_base_port]
 ./mercury -h
 
 Options:
- -c [cpu_nr]                Run on CPU cpu_nr. Defaults to CPU 3. Use -1 to disable CPU selection.
+ -c [cpu_nr]                Run on CPU [cpu_br]. Defaults to CPU 3. Use -1 to disable CPU selection.
  -m [mode]                  Available operating modes are: ARQ, TX_SHM, RX_SHM, TX_TEST, RX_TEST, TX_RAND, RX_RAND, PLOT_BASEBAND, PLOT_PASSBAND.
- -s [modulation_config]     Sets modulation configuration for non-ARQ setups (0 to 16). Use "-l" for listing all available modulations.
+ -s [modulation_config]     Sets modulation configuration for all modes including ARQ, except when gear-shift is enabled. Modes: 0 to 16. Use "-l" for listing all available modulations.
  -r [radio_type]            Available radio types are: stockhf, sbitx.
  -i [device]                Radio Capture device id (eg: "plughw:0,0").
  -o [device]                Radio Playback device id (eg: "plughw:0,0").
- -x [sound_system]          Sets the sound system API to use: alsa, pulse, dsound or wasapi.
+ -x [sound_system]          Sets the sound system API to use: alsa, pulse, dsound or wasapi. Default is alsa on Linux and dsound on Windows.
  -p [arq_tcp_base_port]     Sets the ARQ TCP base port (control is base_port, data is base_port + 1). Default is 7002.
- -g                         Enables the adaptive modulation/robustness selection (gear-shifting). Experimental!
+ -g                         Enables the adaptive modulation selection (gear-shifting). Not working yet!.
  -l                         Lists all modulator/coding modes.
  -z                         Lists all available sound cards.
  -h                         Prints this help.
diff --git a/source/main.cc b/source/main.cc
index b1571d4..b06f645 100644
--- a/source/main.cc
+++ b/source/main.cc
@@ -68,19 +68,19 @@ int main(int argc, char *argv[])
     if (argc < 2)
     {
  manual:
-        printf("Usage modes: \n%s -m [mode] -i [device] -o [device] -r [radio_type] -x [sound_system]\n", argv[0], argv[0]);
-        printf("%s -m ARQ -i [device] -o [device] -r [radio_type] -x [sound_system] -p [arq_tcp_base_port]\n", argv[0], argv[0]);
+        printf("Usage modes: \n%s -m [mode] -s [modulation_config] -i [device] -o [device] -r [radio_type] -x [sound_system]\n", argv[0], argv[0]);
+        printf("%s -m ARQ -s [modulation_config] -i [device] -o [device] -r [radio_type] -x [sound_system] -p [arq_tcp_base_port]\n", argv[0], argv[0]);
         printf("%s -h\n", argv[0]);
         printf("\nOptions:\n");
         printf(" -c [cpu_nr]                Run on CPU [cpu_br]. Defaults to CPU 3. Use -1 to disable CPU selection.\n");
         printf(" -m [mode]                  Available operating modes are: ARQ, TX_SHM, RX_SHM, TX_TEST, RX_TEST, TX_RAND, RX_RAND, PLOT_BASEBAND, PLOT_PASSBAND.\n");
-        printf(" -s [modulation_config]     Sets modulation configuration for non-ARQ setups (0 to 16). Use \"-l\" for listing all available modulations.\n");
+        printf(" -s [modulation_config]     Sets modulation configuration for all modes including ARQ, except when gear-shift is enabled. Modes: 0 to 16. Use \"-l\" for listing all available modulations.\n");
         printf(" -r [radio_type]            Available radio types are: stockhf, sbitx.\n");
         printf(" -i [device]                Radio Capture device id (eg: \"plughw:0,0\").\n");
         printf(" -o [device]                Radio Playback device id (eg: \"plughw:0,0\").\n");
-        printf(" -x [sound_system]          Sets the sound system API to use: alsa, pulse, dsound or wasapi.\n");
+        printf(" -x [sound_system]          Sets the sound system API to use: alsa, pulse, dsound or wasapi. Default is alsa on Linux and dsound on Windows.\n");
 		printf(" -p [arq_tcp_base_port]     Sets the ARQ TCP base port (control is base_port, data is base_port + 1). Default is 7002.\n");
-        printf(" -g                         Enables the adaptive modulation selection (gear-shifting). Experimental.\n");
+        printf(" -g                         Enables the adaptive modulation selection (gear-shifting). Not working yet!.\n");
         printf(" -l                         Lists all modulator/coding modes.\n");
         printf(" -z                         Lists all available sound cards.\n");
         printf(" -h                         Prints this help.\n");