diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index 8c1f03a..6de4bfa 100644
--- a/runtime/doc/diff.txt
+++ b/runtime/doc/diff.txt
@@ -1,4 +1,4 @@
-*diff.txt*      For Vim version 8.1.  Last change: 2019 Jul 27
+*diff.txt*      For Vim version 8.1.  Last change: 2019 Nov 10
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -68,11 +68,12 @@
 The options can still be overruled from a modeline when re-editing the file.
 However, 'foldmethod' and 'wrap' won't be set from a modeline when 'diff' is
 set.
+See `:diffoff` for an easy way to revert the options.
 
 The differences shown are actually the differences in the buffer.  Thus if you
 make changes after loading a file, these will be included in the displayed
 diffs.  You might have to do ":diffupdate" now and then, not all changes are
-immediately taken into account.
+immediately taken into account, especially when using an external diff command.
 
 In your .vimrc file you could do something special when Vim was started in
 diff mode.  You could use a construct like this: >