diff --git a/mm/filemap.c b/mm/filemap.c
index 9620696f880c..5be57ba01d33 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1767,7 +1767,7 @@ EXPORT_SYMBOL(page_cache_prev_miss);
  * @mapping: the address_space to search
  * @index: The page cache index.
  *
- * Looks up the page cache slot at @mapping & @offset.  If there is a
+ * Looks up the page cache slot at @mapping & @index.  If there is a
  * page cache page, the head page is returned with an increased refcount.
  *
  * If the slot holds a shadow entry of a previously evicted page, or a