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)