diff --git a/NEWS b/NEWS
index 0845ec7..0e34080 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 
 Version 0.8:
 
+- added libraw1394/ieee1394.h with useful defines (especially ack and rcodes)
 - function to query isochronous resource manager ID
 - functions for isochronous sending
 - new raw1394_reset_bus() function to reset the bus
diff --git a/src/Makefile.am b/src/Makefile.am
index 78fb027..c10cae5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,7 +15,7 @@ libraw1394_la_SOURCES =   \
 	raw1394_private.h
 
 # headers to be installed
-pkginclude_HEADERS = raw1394.h csr.h
+pkginclude_HEADERS = raw1394.h csr.h ieee1394.h
 
 # testlibraw
 noinst_PROGRAMS = testlibraw
diff --git a/src/ieee1394.h b/src/ieee1394.h
new file mode 100644
index 0000000..96a8308
--- /dev/null
+++ b/src/ieee1394.h
@@ -0,0 +1,36 @@
+#ifndef _LIBRAW1394_IEEE1394_H
+#define _LIBRAW1394_IEEE1394_H
+
+#define L1394_RCODE_COMPLETE           0x0
+#define L1394_RCODE_CONFLICT_ERROR     0x4
+#define L1394_RCODE_DATA_ERROR         0x5
+#define L1394_RCODE_TYPE_ERROR         0x6
+#define L1394_RCODE_ADDRESS_ERROR      0x7
+
+#define L1394_ACK_COMPLETE             0x1
+#define L1394_ACK_PENDING              0x2
+#define L1394_ACK_BUSY_X               0x4
+#define L1394_ACK_BUSY_A               0x5
+#define L1394_ACK_BUSY_B               0x6
+#define L1394_ACK_DATA_ERROR           0xd
+#define L1394_ACK_TYPE_ERROR           0xe 
+
+#define L1394_SPEED_100                0x0
+#define L1394_SPEED_200                0x1
+#define L1394_SPEED_400                0x2 
+
+#define L1394_SELFID_PWRCL_NO_POWER    0x0
+#define L1394_SELFID_PWRCL_PROVIDE_15W 0x1
+#define L1394_SELFID_PWRCL_PROVIDE_30W 0x2
+#define L1394_SELFID_PWRCL_PROVIDE_45W 0x3
+#define L1394_SELFID_PWRCL_USE_1W      0x4
+#define L1394_SELFID_PWRCL_USE_3W      0x5
+#define L1394_SELFID_PWRCL_USE_6W      0x6
+#define L1394_SELFID_PWRCL_USE_10W     0x7
+
+#define L1394_SELFID_PORT_CHILD        0x3
+#define L1394_SELFID_PORT_PARENT       0x2
+#define L1394_SELFID_PORT_NCONN        0x1
+#define L1394_SELFID_PORT_NONE         0x0   
+
+#endif /* _LIBRAW1394_IEEE1394_H */