- doc: /* *If a number, scroll display up aggressively.
-If scrolling a window because point is below the window end, choose
-a new window start so that point ends up that fraction of the window's
-height from the bottom of the window. */);
-
+ doc: /* How far to scroll windows upward.
+If you move point off the bottom, the window scrolls automatically.
+This variable controls how far it scrolls. nil, the default,
+means scroll to center point. A fraction means scroll to put point
+that fraction of the window's height from the bottom of the window.
+When the value is 0.0, point goes at the bottom line, which in the simple
+case that you moved off with C-f means scrolling just one line. 1.0 means
+point goes at the top, so that in that simple case, the window
+window scrolls by a full window height. Meaningful values are
+between 0.0 and 1.0, inclusive. */);
+