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-rw-r--r--src/include/gpxe/pci.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/gpxe/pci.h b/src/include/gpxe/pci.h
index fdcecb6d..90721574 100644
--- a/src/include/gpxe/pci.h
+++ b/src/include/gpxe/pci.h
@@ -156,6 +156,7 @@
#define PCI_CAP_ID_SLOTID 0x04 /* Slot Identification */
#define PCI_CAP_ID_MSI 0x05 /* Message Signalled Interrupts */
#define PCI_CAP_ID_CHSWP 0x06 /* CompactPCI HotSwap */
+#define PCI_CAP_ID_EXP 0x10 /* PCI Express */
#define PCI_CAP_LIST_NEXT 1 /* Next capability in the list */
#define PCI_CAP_FLAGS 2 /* Capability defined flags (16 bits) */
#define PCI_CAP_SIZEOF 4