diff --git a/Part3/09_memory/kernel/kernel.c b/Part3/09_memory/kernel/kernel.c
index 00a529c..7edb245 100644
--- a/Part3/09_memory/kernel/kernel.c
+++ b/Part3/09_memory/kernel/kernel.c
@@ -40,7 +40,11 @@
                 char *number = input + 4;
                 kprint(number);
                 u32 result = digit_conver(number);
-                umem_head = add_node( umem_head, result, 0x100, true, global_id++);
+                if (result < 10000) {
+                    kprint("That memory address is reserved by the Kernel, addresses must be 10000+");
+                } else {
+                    umem_head = add_node( umem_head, result, 0x100, true, global_id++);
+                }
             } else {
                 umem_head = add_node( umem_head, 0x10000, 0x100, true, global_id++);
             }