Update runtime files.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 9d2d6bf..b5e9626 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -846,6 +846,8 @@
'{A-Z0-9}, or `{A-Z0-9} command takes one to another file.
Note that for some commands the 'autowrite' option is not used, see
'autowriteall' for that.
+ Some buffers will not be written, specifically when 'buttype' is
+ "nowrite", "nofile", "terminal" or "prompt".
*'autowriteall'* *'awa'* *'noautowriteall'* *'noawa'*
'autowriteall' 'awa' boolean (default off)