Tweed: Include /etc/guix in description of directory structure.HEADmaster

* README.md[Directory Structure]: Edit directory tree. Add description.

1 files changed, 10 insertions, 7 deletions

diff --git a/README.md b/README.md
index 8a46931..332fa73 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # Tweed.README
-Copyright © 2016, 2017, 2018 Paul Garlick <[pgarlick@tourbillion-technology.com](mailto:pgarlick@tourbillion-technology.com)>
+Copyright © 2016, 2017, 2018, 2020 Paul Garlick <[pgarlick@tourbillion-technology.com](mailto:pgarlick@tourbillion-technology.com)>
 
   Copying and distribution of this file, with or without modification,
   are permitted in any medium without royalty provided the copyright
@@ -92,16 +92,19 @@ following applications:
 
 ## Directory Structure
 
-The directory structure for a typical *TWEED* installation is shown in the
-diagram below.  The configuration files are stored in the *tweed* directory,
-located in the user's home directory.  The three package managers use the
-directories $HOME/.hashdist, /gnu and /nix respectively to store the
-application files.  GNU Guix uses sub-directories in /var to store log files
-and database files.
+The directory structure for a typical *TWEED* installation is shown in
+the diagram below.  The configuration files are stored in the *tweed*
+directory, located in the user's home directory.  The three package
+managers use the directories $HOME/.hashdist, /gnu and /nix
+respectively to store the application files.  GNU Guix uses a
+sub-directory in /etc to store public keys of authorised servers and a
+sub-directory in /var to store log files and database files.
 
 ~~~
   / (root)
   ├── OS
+  ├── etc
+  │   └── guix
   ├── var
   │   ├── guix
   │   └── log