diff --git a/mm/memory.c b/mm/memory.c
index 583f84519870..5c356a57b892 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2009,7 +2009,7 @@ EXPORT_SYMBOL(remap_pfn_range);
 /**
  * vm_iomap_memory - remap memory to userspace
  * @vma: user vma to map to
- * @start: start of area
+ * @start: start of the physical memory to be mapped
  * @len: size of area
  *
  * This is a simplified io_remap_pfn_range() for common driver use. The