+@cindex non-selected windows, mode line appearance
+@vindex mode-line-in-non-selected-windows
+ By default, the mode line of non-selected windows is displayed in a
+different face, called @code{mode-line-inactive}. You can control
+this behavior by customizing the value of the variable
+@code{mode-line-in-non-selected-windows}. If its value is
+non-@code{nil}, non-selected windows are displayed in the
+@code{mode-line-inactive} face. If the value is @code{t}, the
+selected window is displayed in the @code{mode-line} face even when
+you type at the minibuffer prompt. If the value is @code{nil}, all
+mode lines are displayed in the @code{mode-line} face, even when the
+window is not selected. The default is @code{t}.
+