indicate the maximum number of classes to display.
On XEmacs, a full list of classes will also be placed into a `help-echo'
-property on the competion items, so that the list of classes for the current
+property on the completion items, so that the list of classes for the current
item is displayed in the echo area. If the value of this variable is a
negative integer, the `help-echo' property will be suppressed."
:group 'idlwave-completion