diff --git a/include/libopencm3/cm3/vector.h b/include/libopencm3/cm3/vector.h
index 2afaab45..a679a6e0 100644
--- a/include/libopencm3/cm3/vector.h
+++ b/include/libopencm3/cm3/vector.h
@@ -59,6 +59,8 @@ typedef struct {
 	vector_table_entry_t pend_sv;
 	vector_table_entry_t systick;
 	vector_table_entry_t irq[NVIC_IRQ_COUNT];
+	/* https://www.feaser.com/openblt/doku.php?id=manual:ports:armcm3_stm32 */
+	vector_table_entry_t openblt_signature;
 } vector_table_t;
 
 /* Common symbols exported by the linker script(s): */