diff --git a/kern/kalloc.c b/kern/kalloc.c
index 88238ee..dead607 100644
--- a/kern/kalloc.c
+++ b/kern/kalloc.c
@@ -46,6 +46,7 @@ void kfree(void *pa) {
     if (((u64)pa % PGSIZE) != 0 || (char *)pa < kernel_end || (u64)pa >= PHYSTOP)
         PANIC("kfree");
 
+    // TODO: Kconfig this
     // Fill with junk to catch dangling refs.
     memset(pa, 1, PGSIZE);