diff --git a/configs/README.txt b/configs/README.txt
index f53cb2a82b..8154c22c23 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -1010,6 +1010,13 @@ defconfig -- This is a configuration file similar to the Linux
 		  be defined to offset the CDC/ACM interface numbers so that they are
 		  unique and contiguous.  When used with the Mass Storage driver, the
 		  correct value for this offset is zero.
+		CONFIG_CDCACM_STRBASE
+		  If the CDC driver is part of a composite device, then this may need to 
+		  be defined to offset the CDC/ACM string numbers so that they are
+		  unique and contiguous.  When used with the Mass Storage driver, the
+		  correct value for this offset is four (this value actuallly only needs
+		  to be defined if names are provided for the Notification interface,
+		  CONFIG_CDCACM_NOTIFSTR, or the data interface, CONFIG_CDCACM_DATAIFSTR).
 		CONFIG_CDCACM_EP0MAXPACKET
 		  Endpoint 0 max packet size. Default 64.
 		CONFIG_CDCACM_EPINTIN
@@ -1067,7 +1074,13 @@ defconfig -- This is a configuration file similar to the Linux
 		  be defined to offset the mass storage interface number so that it is
 		  unique and contiguous.  When used with the CDC/ACM driver, the
 		  correct value for this offset is two (because of the two CDC/ACM
- 		  interfaces that will precede it).
+		  interfaces that will precede it).
+		CONFIG_USBMSC_STRBASE
+		  If the CDC driver is part of a composite device, then this may need to 
+		  be defined to offset the mass storage string numbers so that they are
+		  unique and contiguous.  When used with the CDC/ACM driver, the
+		  correct value for this offset is four (or perhaps 5 or 6, depending
+		  on if CONFIG_CDCACM_NOTIFSTR or CONFIG_CDCACM_DATAIFSTR are defined).
 		CONFIG_USBMSC_EP0MAXPACKET
 		  Max packet size for endpoint 0
 		CONFIG_USBMSCEPBULKOUT and CONFIG_USBMSC_EPBULKIN
diff --git a/configs/stm3210e-eval/composite/defconfig b/configs/stm3210e-eval/composite/defconfig
index 46fa448141..7fb3b3ae81 100755
--- a/configs/stm3210e-eval/composite/defconfig
+++ b/configs/stm3210e-eval/composite/defconfig
@@ -719,6 +719,12 @@ CONFIG_PL2303_TXBUFSIZE=512
 #   unique and contiguous.  When used with the CDC/ACM driver, the
 #   correct value for this offset is two (because of the two CDC/ACM
 #   interfaces that will precede it).
+# CONFIG_USBMSC_STRBASE
+#   If the CDC driver is part of a composite device, then this may need to 
+#   be defined to offset the mass storage string numbers so that they are
+#   unique and contiguous.  When used with the CDC/ACM driver, the
+#   correct value for this offset is four (or perhaps 5 or 6, depending
+#   on if CONFIG_CDCACM_NOTIFSTR or CONFIG_CDCACM_DATAIFSTR are defined).
 # CONFIG_USBMSC_EP0MAXPACKET
 #   Max packet size for endpoint 0
 # CONFIG_USBMSC_EPBULKOUT and CONFIG_USBMSC_EPBULKIN
@@ -740,6 +746,7 @@ CONFIG_PL2303_TXBUFSIZE=512
 CONFIG_USBMSC=y
 CONFIG_USBMSC_COMPOSITE=y
 CONFIG_USBMSC_IFNOBASE=2
+CONFIG_USBMSC_STRBASE=4
 CONFIG_USBMSC_EP0MAXPACKET=64
 CONFIG_USBMSC_EPBULKOUT=4
 CONFIG_USBMSC_EPBULKIN=5
@@ -767,6 +774,13 @@ CONFIG_USBMSC_REMOVABLE=y
 #   be defined to offset the CDC/ACM interface numbers so that they are
 #   unique and contiguous.  When used with the Mass Storage driver, the
 #   correct value for this offset is zero.
+# CONFIG_CDCACM_STRBASE
+#   If the CDC driver is part of a composite device, then this may need to 
+#   be defined to offset the CDC/ACM string numbers so that they are
+#   unique and contiguous.  When used with the Mass Storage driver, the
+#   correct value for this offset is four (this value actuallly only needs
+#   to be defined if names are provided for the Notification interface,
+#   CONFIG_CDCACM_NOTIFSTR, or the data interface, CONFIG_CDCACM_DATAIFSTR).
 # CONFIG_CDCACM_EP0MAXPACKET
 #   Endpoint 0 max packet size. Default 64
 # CONFIG_CDCACM_EPINTIN
@@ -814,6 +828,7 @@ CONFIG_USBMSC_REMOVABLE=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_COMPOSITE=y
 CONFIG_CDCACM_IFNOBASE=0
+CONFIG_CDCACM_STRBASE=4
 #CONFIG_CDCACM_EP0MAXPACKET
 CONFIG_CDCACM_EPINTIN=1
 #CONFIG_CDCACM_EPINTIN_FSSIZE