-.BI "\-t, \-\-title " title
-Sets the title of the dialogue box to
-.IR title .
-The default title is
-.RB ` "Input request" '.
-.TP 5
-.BI "\-p, \-\-prompt " prompt
-Sets the prompt string in the dialogue box to
-.IR prompt .
-The default is to have no prompt string.
+.BI "\-M, \-\-histmax " max
+When writing an updated history file, do not write more than
+.I max
+lines. The default is 20; a value of 0 disables a length limit on the
+history file.