diff --git a/include/exec/memory.h b/include/exec/memory.h
index ed29276..c6fb714 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -998,6 +998,7 @@
  * @size: size of the region.
  * @share: %true if memory must be mmaped with the MAP_SHARED flag
  * @fd: the fd to mmap.
+ * @offset: offset within the file referenced by fd
  * @errp: pointer to Error*, to store an error if it happens.
  *
  * Note that this function does not do anything to cause the data in the
@@ -1009,6 +1010,7 @@
                                     uint64_t size,
                                     bool share,
                                     int fd,
+                                    ram_addr_t offset,
                                     Error **errp);
 #endif