diff --git a/include/sys/arch_interface.h b/include/sys/arch_interface.h
index b60827c0678..fad6f92762d 100644
--- a/include/sys/arch_interface.h
+++ b/include/sys/arch_interface.h
@@ -578,6 +578,8 @@ void arch_mem_domain_destroy(struct k_mem_domain *domain);
  * if the supplied memory buffer spans multiple enabled memory management
  * regions (even if all such regions permit user access).
  *
+ * @warning 0 size buffer has undefined behavior.
+ *
  * @param addr start address of the buffer
  * @param size the size of the buffer
  * @param write If nonzero, additionally check if the area is writable.