diff --git a/scd/scdaemon.c b/scd/scdaemon.c
index 83f24577a..6d068d3d3 100644
--- a/scd/scdaemon.c
+++ b/scd/scdaemon.c
@@ -194,6 +194,7 @@ static struct debug_flags_s debug_flags [] =
     { DBG_MEMSTAT_VALUE, "memstat" },
     { DBG_HASHING_VALUE, "hashing" },
     { DBG_IPC_VALUE    , "ipc"     },
+    { DBG_CARD_VALUE   , "card"    },
     { DBG_CARD_IO_VALUE, "cardio"  },
     { DBG_READER_VALUE , "reader"  },
     { DBG_APP_VALUE    , "app"     },
diff --git a/scd/scdaemon.h b/scd/scdaemon.h
index 071960c6c..b2a1d2fcc 100644
--- a/scd/scdaemon.h
+++ b/scd/scdaemon.h
@@ -69,15 +69,16 @@ struct
 } opt;
 
 
-#define DBG_APP_VALUE     1     /* Debug app speific stuff.  */
+#define DBG_APP_VALUE     1     /* Debug app specific stuff.  */
 #define DBG_MPI_VALUE	  2	/* debug mpi details */
 #define DBG_CRYPTO_VALUE  4	/* debug low level crypto */
+#define DBG_CARD_VALUE    16    /* debug card info  */
 #define DBG_MEMORY_VALUE  32	/* debug memory allocation stuff */
 #define DBG_CACHE_VALUE   64	/* debug the caching */
 #define DBG_MEMSTAT_VALUE 128	/* show memory statistics */
 #define DBG_HASHING_VALUE 512	/* debug hashing operations */
 #define DBG_IPC_VALUE     1024
-#define DBG_CARD_IO_VALUE 2048
+#define DBG_CARD_IO_VALUE 2048  /* debug card I/O (e.g. APDUs).  */
 #define DBG_READER_VALUE  4096  /* Trace reader related functions.  */
 
 #define DBG_APP     (opt.debug & DBG_APP_VALUE)
@@ -86,6 +87,7 @@ struct
 #define DBG_CACHE   (opt.debug & DBG_CACHE_VALUE)
 #define DBG_HASHING (opt.debug & DBG_HASHING_VALUE)
 #define DBG_IPC     (opt.debug & DBG_IPC_VALUE)
+#define DBG_CARD    (opt.debug & DBG_CARD_VALUE)
 #define DBG_CARD_IO (opt.debug & DBG_CARD_IO_VALUE)
 #define DBG_READER  (opt.debug & DBG_READER_VALUE)