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-rw-r--r--src/include/cbmem.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 59f4e105e1..680284acf1 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -70,7 +70,8 @@ void cbmem_top_init(void);
/* Return the top address for dynamic cbmem. The address returned needs to
* be consistent across romstage and ramstage, and it is required to be
- * below 4GiB.
+ * below 4GiB for 32bit coreboot builds. On 64bit coreboot builds there's no
+ * upper limit.
* x86 boards or chipsets must return NULL before the cbmem backing store has
* been initialized. */
void *cbmem_top(void);