Improved README.

diff --git a/README.md b/README.md
index 533e245..6f7f620 100644 (file)
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+++ b/README.md
@@ -3,14 +3,15 @@
 Elpher aims to provide a full-featured gopher client for GNU Emacs.
 
 It supports:
-- simple keyboard and mouse-driven browsing,
+- simple keyboard and mouse-driven browsing, including out-of-the-box
+  compatibility with evil-mode,
 - caching of visited sites,
 - clean and configurable visualization of Gopher directories,
 - direct visualisation of image files,
 - clickable web and gopher links in plain text.
 
 Elpher is still under development.  Planned features include:
-- (m)enu key support, similar to the emacs info browser,
+- (m)enu key support, similar to the Emacs info browser,
 - support for multiple Elpher buffers.
 
 Keep the non-web internet alive!
@@ -19,6 +20,54 @@ Keep the non-web internet alive!
 
 Installation instructions will be added soon.
 
+## Usage
+
+Once installed, use `M-x elpher` to launch the browser.  This will
+open a start page which documents the default key bindings and
+provides some links to help kick start your exploration of gopherspace.
+
+To customize the various faces Elpher uses, the start page
+and a few other odds and ends, simply use `M-x customize-group`
+and enter "elpher" at the group prompt.
+
+## History and Caching
+
+This is an aspect of Elpher that perhaps requires separate explanation.
+
+Every item you visit with Elpher is modeled as a "node" in a tree.
+For instance, a gopher directory represents a single node.  When
+you open such a directory, Elpher creates nodes for every entry
+in that directory and makes these children of the original directory node:
+
+               X  <- current directory node
+               |
+            -------
+            |  |  |
+            o  o  o  <- nodes representing entries in directory
+
+If one of those entries is itself a directory and you click on it,
+Elpher marks that node the current node, and extends the tree as follows:
+
+               o  <- original directory node
+               |
+            -------
+            |  |  |
+            o  o  X  <- current directory node (marked with X)
+                  |
+              ---------
+              | | | | |
+              o o o o o  <- nodes representing entries in new directory
+              
+Pressing the 'u' button (introduced on page which opens when elopher starts)
+always moves to the page representing "parent" node, whatever that is.
+
+Once a node is visited, its "contents" (i.e. whatever is retrieved
+from the gopher server) are recorded with the corresponding node.  The
+cursor position (point) is also stored. If the node is visited again,
+the cached contents are displayed and the cursor returns to its
+previous position.  This makes navigating amongst different documents
+referenced from within the same directory very snappy.
+
 ## Licence
 
 Elpher is free software and is distributed under the terms of version