diff --git a/include/services/el3_spmc_ffa_memory.h b/include/services/el3_spmc_ffa_memory.h
index 8e0c5ae..2037eca 100644
--- a/include/services/el3_spmc_ffa_memory.h
+++ b/include/services/el3_spmc_ffa_memory.h
@@ -63,6 +63,8 @@
  * typedef ffa_mem_attr8_t - Memory region attributes v1.0.
  * typedef ffa_mem_attr16_t - Memory region attributes v1.1.
  *
+ * * @FFA_MEM_ATTR_NS_BIT:
+ *     Memory security state.
  * * @FFA_MEM_ATTR_DEVICE_NGNRNE:
  *     Device-nGnRnE.
  * * @FFA_MEM_ATTR_DEVICE_NGNRE:
@@ -84,6 +86,7 @@
  */
 typedef uint8_t ffa_mem_attr8_t;
 typedef uint16_t ffa_mem_attr16_t;
+#define FFA_MEM_ATTR_NS_BIT			(0x1U << 6)
 #define FFA_MEM_ATTR_DEVICE_NGNRNE		((1U << 4) | (0x0U << 2))
 #define FFA_MEM_ATTR_DEVICE_NGNRE		((1U << 4) | (0x1U << 2))
 #define FFA_MEM_ATTR_DEVICE_NGRE		((1U << 4) | (0x2U << 2))