Add Paging Up And Down as a tmux til.

README.md

@@ -214,6 +214,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Jumping Between Sessions](tmux/jumping-between-sessions.md)
 - [List All Key Bindings](tmux/list-all-key-bindings.md)
 - [Organizing Windows](tmux/organizing-windows.md)
+- [Paging Up And Down](tmux/paging-up-and-down.md)
 - [Pane Killer](tmux/pane-killer.md)
 - [Reclaiming The Entire Window](tmux/reclaiming-the-entire-window.md)
 - [Swap Split Panes](tmux/swap-split-panes.md)

tmux/paging-up-and-down.md

@@ -0,0 +1,9 @@
+# Paging Up And Down
+
+When in _copy mode_ (`<prefix>[`), you can move the cursor around like you
+would in vim with the directional keys (`hjkl`). This works fine until you
+want to move up or down through pages and pages of text, such as when
+navigating to the top of a long stack trace. One way to get where you need
+to be more quickly is by paging up and down.
+
+Hit `CTRL-u` to page up and `CTRL-d` to page down.