diff --git a/sam3s_example/simtrace/usb.c b/sam3s_example/simtrace/usb.c
index 91e94e2..923ce2d 100644
--- a/sam3s_example/simtrace/usb.c
+++ b/sam3s_example/simtrace/usb.c
@@ -189,7 +189,7 @@
         USBGenericDescriptor_INTERFACE,
         0, /* This is interface #0 */
         0, /* This is alternate setting #0 for this interface */
-        3, /* This interface uses 3 endpoints */
+        3, /* Number of endpoints */
         0xff, /* Descriptor Class: Vendor specific */
         0, /* No subclass */
         0, /* No l */
@@ -365,7 +365,7 @@
         USBGenericDescriptor_INTERFACE,
         0, /* This is interface #0 */
         0, /* This is alternate setting #0 for this interface */
-        3, /* This interface uses 3 endpoints */
+        4, /* Number of endpoints */
         0xff, /* Descriptor Class: Vendor specific */
         0, /* No subclass */
         0, /* No l */
@@ -439,7 +439,7 @@
         USBGenericDescriptor_INTERFACE,
         0, /* This is interface #0 */
         0, /* This is alternate setting #0 for this interface */
-        3, /* This interface uses 3 endpoints */
+        3, /* Number of endpoints */
         //CDCCommunicationInterfaceDescriptor_CLASS,
         0xff,
 //        CDCCommunicationInterfaceDescriptor_ABSTRACTCONTROLMODEL,
@@ -486,7 +486,7 @@
         USBGenericDescriptor_INTERFACE,
         1, /* This is interface #1 */
         0, /* This is alternate setting #0 for this interface */
-        3, /* This interface uses 3 endpoints */
+        3, /* Number of endpoints */
         0xff,
         0,
         0,