diff --git a/include/NVMeBasicContext.hpp b/include/NVMeBasicContext.hpp
index 6b0a425..6953dd7 100644
--- a/include/NVMeBasicContext.hpp
+++ b/include/NVMeBasicContext.hpp
@@ -22,4 +22,10 @@
     boost::asio::io_service& io;
     boost::asio::posix::stream_descriptor reqStream;
     boost::asio::posix::stream_descriptor respStream;
+
+    enum
+    {
+        NVME_MI_BASIC_SFLGS_DRIVE_NOT_READY = 0x40,
+        NVME_MI_BASIC_SFLGS_DRIVE_FUNCTIONAL = 0x20,
+    };
 };