diff --git a/man2/sync_file_range.2 b/man2/sync_file_range.2
index 112658ac9..9bae126b6 100644
--- a/man2/sync_file_range.2
+++ b/man2/sync_file_range.2
@@ -70,6 +70,8 @@ before performing any write.
 .B SYNC_FILE_RANGE_WRITE
 Initiate write-out of all dirty pages in the specified
 range which are not presently submitted write-out.
+Note that even this may may block if you attempt to
+write more than request queue size.
 .TP
 .B SYNC_FILE_RANGE_WAIT_AFTER
 Wait upon write-out of all pages in the range