diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index ea247e2..bfa8068 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -2623,11 +2623,17 @@
 	Change the way text is displayed.  This is comma separated list of
 	flags:
 	lastline	When included, as much as possible of the last line
-			in a window will be displayed.  When not included, a
-			last line that doesn't fit is replaced with "@" lines.
+			in a window will be displayed.  "@@@" is put in the
+			last columns of the last screen line to indicate the
+			rest of the line is not displayed.
+	truncate	Like "lastline", but "@@@" is displayed in the first
+			column of the last screen line.  Overrules "lastline".
 	uhex		Show unprintable characters hexadecimal as <xx>
 			instead of using ^C and ~C.
 
+	When neither "lastline" or "truncate" is included, a last line that
+	doesn't fit is replaced with "@" lines.
+
 						*'eadirection'* *'ead'*
 'eadirection' 'ead'	string	(default "both")
 			global