diff --git a/src/jtag3.c b/src/jtag3.c
index 2d2eedd1..62b95779 100644
--- a/src/jtag3.c
+++ b/src/jtag3.c
@@ -1569,7 +1569,7 @@ int jtag3_open_common(PROGRAMMER *pgm, const char *port) {
     pmsg_notice("found CMSIS-DAP compliant device, using EDBG protocol\n");
   }
 
-  // Copy over pointer to USB serial number function
+  // Make USB serial number available to programmer
   if (serdev && serdev->usbsn)
     pgm->usbsn = serdev->usbsn;
 
diff --git a/src/stk500v2.c b/src/stk500v2.c
index a60fe666..49a331f3 100644
--- a/src/stk500v2.c
+++ b/src/stk500v2.c
@@ -1578,7 +1578,7 @@ static int stk500v2_open(PROGRAMMER *pgm, const char *port) {
     return -1;
   }
 
-  // Copy over pointer to USB serial number function
+  // Make USB serial number available to programmer
   if (serdev && serdev->usbsn)
     pgm->usbsn = serdev->usbsn;