diff --git a/include/asm-s390/dasd.h b/include/asm-s390/dasd.h
index 1630c26..c042f95 100644
--- a/include/asm-s390/dasd.h
+++ b/include/asm-s390/dasd.h
@@ -68,10 +68,12 @@
  * 0x00: default features
  * 0x01: readonly (ro)
  * 0x02: use diag discipline (diag)
+ * 0x04: set the device initially online (internal use only)
  */
-#define DASD_FEATURE_DEFAULT  0
-#define DASD_FEATURE_READONLY 1
-#define DASD_FEATURE_USEDIAG  2
+#define DASD_FEATURE_DEFAULT	     0x00
+#define DASD_FEATURE_READONLY	     0x01
+#define DASD_FEATURE_USEDIAG	     0x02
+#define DASD_FEATURE_INITIAL_ONLINE  0x04
 
 #define DASD_PARTN_BITS 2