diff --git a/[refs] b/[refs]
index fd56ac5c0ec2..0e70cb3d9719 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 604bf5a216e7f2d97cdf62614ca1281921531040
+refs/heads/master: 469eb4d03878b676418f853011ebfb54ccf83a5e
diff --git a/trunk/mm/filemap.c b/trunk/mm/filemap.c
index d4ff48ec269e..c1b1708cc95d 100644
--- a/trunk/mm/filemap.c
+++ b/trunk/mm/filemap.c
@@ -175,7 +175,7 @@ static int sync_page(void *word)
  * dirty pages that lie within the byte offsets <start, end>
  * @mapping:	address space structure to write
  * @start:	offset in bytes where the range starts
- * @end:	offset in bytes where the range ends
+ * @end:	offset in bytes where the range ends (inclusive)
  * @sync_mode:	enable synchronous operation
  *
  * If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
@@ -368,6 +368,12 @@ int filemap_write_and_wait(struct address_space *mapping)
 }
 EXPORT_SYMBOL(filemap_write_and_wait);
 
+/*
+ * Write out and wait upon file offsets lstart->lend, inclusive.
+ *
+ * Note that `lend' is inclusive (describes the last byte to be written) so
+ * that this function can be used to write to the very end-of-file (end = -1).
+ */
 int filemap_write_and_wait_range(struct address_space *mapping,
 				 loff_t lstart, loff_t lend)
 {