diff --git a/isotpdump.c b/isotpdump.c
index 4e2dbaf..96ad307 100644
--- a/isotpdump.c
+++ b/isotpdump.c
@@ -125,7 +125,7 @@ void print_uds_message(int service, int nrc)
 	case 0x3D: service_name = "WriteMemoryByAddress"; break;
 	case 0x3E: service_name = "TesterPresent"; break;
 	case 0x83: service_name = "AccessTimingParameter"; break;
-	case 0x84: service_name = "SecuredDataTransmision"; break;
+	case 0x84: service_name = "SecuredDataTransmission"; break;
 	case 0x85: service_name = "ControlDTCSetting"; break;
 	case 0x86: service_name = "ResponseOnEvent"; break;
 	case 0x87: service_name = "LinkControl"; break;
diff --git a/slcan_attach.c b/slcan_attach.c
index dc8e9f2..df0dc98 100644
--- a/slcan_attach.c
+++ b/slcan_attach.c
@@ -67,7 +67,7 @@ void print_usage(char *prg)
 	fprintf(stderr, "         -s <speed>  (set CAN speed 0..8)\n");
 	fprintf(stderr, "         -b <btr>    (set bit time register value)\n");
 	fprintf(stderr, "         -d          (only detach line discipline)\n");
-	fprintf(stderr, "         -w          (attach - wait for keypess - detach)\n");
+	fprintf(stderr, "         -w          (attach - wait for keypress - detach)\n");
 	fprintf(stderr, "         -n <name>   (assign created netdevice name)\n");
 	fprintf(stderr, "\n"
 			"    <speed>          Bitrate\n"
diff --git a/testj1939.c b/testj1939.c
index 951fe53..a59be4a 100644
--- a/testj1939.c
+++ b/testj1939.c
@@ -36,7 +36,7 @@ static const char help_msg[] =
 	" -s[=LEN]	Initial send of LEN bytes dummy data\n"
 	" -r		Receive (and print) data\n"
 	" -e		Echo incoming packets back\n"
-	"		This atually receives packets\n"
+	"		This actually receives packets\n"
 	" -c		Issue connect()\n"
 	" -p=PRIO	Set priority to PRIO\n"
 	" -P		Promiscuous mode. Allow to receive all packets\n"