diff --git a/man/atest.1 b/man/atest.1
index 58c90f64..6b715f1f 100644
--- a/man/atest.1
+++ b/man/atest.1
@@ -61,6 +61,11 @@ Force G3RUH modem regardless of data rate.
 .BI  "-D " "n"
 Divide audio sample rate by n.
 
+.TP
+.BI  "-U " "n"
+Override automatic upsampling rate for G3RUH,
+improving performance when sample rate to baud ratio is low.
+
 .TP
 .BI  "-h " 
 Print frame contents as hexadecimal bytes.
@@ -72,6 +77,10 @@ Amount of effort to try fixing frames with an invalid CRC.
 1 = Try to fix only a single bit.
 more = Try modifying more bits to get a good CRC.
 
+.TP
+.BI  "-e " "n"
+Artificially introduce a desired Bit Error Rate (BER) for testing.
+
 .TP
 .BI  "-L " 
 Error if Less than this number decoded.
diff --git a/src/atest.c b/src/atest.c
index c5f4ec50..61184f76 100644
--- a/src/atest.c
+++ b/src/atest.c
@@ -982,11 +982,13 @@ static void usage (void) {
 	dw_printf ("               AIS for ship Automatic Identification System.\n");
 	dw_printf ("               EAS for Emergency Alert System (EAS) Specific Area Message Encoding (SAME).\n");
 	dw_printf ("\n");
-	dw_printf ("        -g     Use G3RUH modem rather rather than default for data rate.\n");
+	dw_printf ("        -g     Use G3RUH modem rather than default for data rate.\n");
 	dw_printf ("        -j     2400 bps QPSK compatible with direwolf <= 1.5.\n");
 	dw_printf ("        -J     2400 bps QPSK compatible with MFJ-2400.\n");
 	dw_printf ("\n");
 	dw_printf ("        -D n   Divide audio sample rate by n.\n");
+	dw_printf ("        -U n   Override automatic upsampling rate for G3RUH,\n");
+	dw_printf ("               improving performance when sample rate to baud ratio is low.\n");
 	dw_printf ("\n");
 	dw_printf ("        -h     Print frame contents as hexadecimal bytes.\n");
 	dw_printf ("\n");
@@ -994,6 +996,7 @@ static void usage (void) {
 	dw_printf ("               0 (default) = consider only correct frames.  \n");
 	dw_printf ("               1 = Try to fix only a single bit.  \n");
 	dw_printf ("               more = Try modifying more bits to get a good CRC.\n");
+	dw_printf ("        -e n   Artificially introduce a desired Bit Error Rate (BER) for testing.\n");
 	dw_printf ("\n");
 	dw_printf ("        -d x   Debug information for FX.25.  Repeat for more detail.\n");
 	dw_printf ("\n");