diff --git a/Demos/Device/LowLevel/MassStorage/Lib/SCSI_Codes.h b/Demos/Device/LowLevel/MassStorage/Lib/SCSI_Codes.h
index 5b6b76ac87..a69aa56feb 100644
--- a/Demos/Device/LowLevel/MassStorage/Lib/SCSI_Codes.h
+++ b/Demos/Device/LowLevel/MassStorage/Lib/SCSI_Codes.h
@@ -70,11 +70,12 @@
 
 		#define SCSI_ASENSE_NO_ADDITIONAL_INFORMATION          0x00
 		#define SCSI_ASENSE_LOGICAL_UNIT_NOT_READY             0x04
-		#define SCSI_ASENSE_INVALID_FIELD_IN_CDB               0x24
-		#define SCSI_ASENSE_WRITE_PROTECTED                    0x27
-		#define SCSI_ASENSE_FORMAT_ERROR                       0x31
 		#define SCSI_ASENSE_INVALID_COMMAND                    0x20
 		#define SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x21
+		#define SCSI_ASENSE_INVALID_FIELD_IN_CDB               0x24
+		#define SCSI_ASENSE_WRITE_PROTECTED                    0x27
+		#define SCSI_ASENSE_NOT_READY_TO_READY_CHANGE          0x28
+		#define SCSI_ASENSE_FORMAT_ERROR                       0x31
 		#define SCSI_ASENSE_MEDIUM_NOT_PRESENT                 0x3A
 
 		#define SCSI_ASENSEQ_NO_QUALIFIER                      0x00
diff --git a/Demos/Host/LowLevel/MassStorageHost/Lib/SCSI_Codes.h b/Demos/Host/LowLevel/MassStorageHost/Lib/SCSI_Codes.h
index 5b6b76ac87..a69aa56feb 100644
--- a/Demos/Host/LowLevel/MassStorageHost/Lib/SCSI_Codes.h
+++ b/Demos/Host/LowLevel/MassStorageHost/Lib/SCSI_Codes.h
@@ -70,11 +70,12 @@
 
 		#define SCSI_ASENSE_NO_ADDITIONAL_INFORMATION          0x00
 		#define SCSI_ASENSE_LOGICAL_UNIT_NOT_READY             0x04
-		#define SCSI_ASENSE_INVALID_FIELD_IN_CDB               0x24
-		#define SCSI_ASENSE_WRITE_PROTECTED                    0x27
-		#define SCSI_ASENSE_FORMAT_ERROR                       0x31
 		#define SCSI_ASENSE_INVALID_COMMAND                    0x20
 		#define SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x21
+		#define SCSI_ASENSE_INVALID_FIELD_IN_CDB               0x24
+		#define SCSI_ASENSE_WRITE_PROTECTED                    0x27
+		#define SCSI_ASENSE_NOT_READY_TO_READY_CHANGE          0x28
+		#define SCSI_ASENSE_FORMAT_ERROR                       0x31
 		#define SCSI_ASENSE_MEDIUM_NOT_PRESENT                 0x3A
 
 		#define SCSI_ASENSEQ_NO_QUALIFIER                      0x00
diff --git a/LUFA/Drivers/USB/Class/Common/MassStorage.h b/LUFA/Drivers/USB/Class/Common/MassStorage.h
index dd2da2ffb4..9a391ee07a 100644
--- a/LUFA/Drivers/USB/Class/Common/MassStorage.h
+++ b/LUFA/Drivers/USB/Class/Common/MassStorage.h
@@ -176,6 +176,11 @@
 		/** SCSI Additional Sense Code to indicate an invalid field was encountered while processing the issued command. */
 		#define SCSI_ASENSE_INVALID_FIELD_IN_CDB               0x24
 
+		/** SCSI Additional Sense Code to indicate that a medium that was previously indicated as not ready has now
+		 *  become ready for use.
+		 */
+		#define SCSI_ASENSE_NOT_READY_TO_READY_CHANGE          0x28
+
 		/** SCSI Additional Sense Code to indicate that an attempt to write to a protected area was made. */
 		#define SCSI_ASENSE_WRITE_PROTECTED                    0x27
 
diff --git a/LUFA/ManPages/ChangeLog.txt b/LUFA/ManPages/ChangeLog.txt
index 45e894d8d5..9ac8cadb23 100644
--- a/LUFA/ManPages/ChangeLog.txt
+++ b/LUFA/ManPages/ChangeLog.txt
@@ -7,6 +7,10 @@
  /** \page Page_ChangeLog Project Changelog
   *
   *  \section Sec_ChangeLogXXXXXX Version XXXXXX
+  *  <b>New:</b>
+  *  - Added new SCSI_ASENSE_NOT_READY_TO_READY_CHANGE constant to the Mass Storage class driver, to indicate when a previously
+  *    not ready removable medium has now become ready for the host's use (thanks to Martin Degelsegger)
+  *
   *  <b>Changed:</b>
   *  - Removed complicated logic for the Endpoint_ConfigureEndpoint() function to use inlined or function called versions
   *    depending of if the given bank size is a compile time constant, as the compiler does a better job of optimizing