diff --git a/configs/README.txt b/configs/README.txt
index b50592b81d..8958ee874a 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -949,7 +949,7 @@ defconfig -- This is a configuration file similar to the Linux
 		CONFIG_CDCSER
 		  Enable compilation of the USB serial driver
 		CONFIG_CDCSER_EP0MAXPACKET
-		  Endpoint 0 max packet size. Default 8.
+		  Endpoint 0 max packet size. Default 64.
 		CONFIG_CDCSER_EPINTIN
 		  The logical 7-bit address of a hardware endpoint that supports
 		  interrupt IN operation.  Default 2.
@@ -958,7 +958,7 @@ defconfig -- This is a configuration file similar to the Linux
 		  Default 64.
 		CONFIG_CDCSER_EPINTIN_HSSIZE
 		  Max package size for the interrupt IN endpoint if high speed mode.
-		  Default 512.
+		  Default 64.
 		CONFIG_CDCSER_EPBULKOUT
 		  The logical 7-bit address of a hardware endpoint that supports
 		  bulk OUT operation